diff --git a/config.toml b/config.toml
index 5d8c9fb..5f49e8d 100644
--- a/config.toml
+++ b/config.toml
@@ -5,7 +5,6 @@ installing_message = "Reminder: yuzu is an <b>experimental</b> emulator. Stuff w
 [[packages]]
 name = "yuzu Nightly"
 description = "The nightly build of yuzu contains already reviewed and tested features."
-default = true
     [packages.source]
     name = "github"
     match = "^yuzu-#PLATFORM#(-mingw)?-[0-9]*-[0-9a-f]*.zip$"
@@ -20,3 +19,13 @@ description = "The canary build of yuzu has additional features that are still w
     match = "^yuzu-#PLATFORM#(-mingw)?-[0-9]*-[0-9a-f]*.zip$"
         [packages.source.config]
         repo = "yuzu-emu/yuzu-canary"
+
+[[packages]]
+name = "Test package"
+description = "Just a testing package"
+default = true
+    [packages.source]
+    name = "github"
+    match = "^TestPackage.zip$"
+        [packages.source.config]
+        repo = "j-selby/test-installer"
diff --git a/src/installer.rs b/src/installer.rs
index a92dcff..b006b62 100644
--- a/src/installer.rs
+++ b/src/installer.rs
@@ -19,11 +19,11 @@ use std::env::var;
 use std::env::current_exe;
 use std::env::consts::OS;
 
+use std::path::Path;
 use std::path::PathBuf;
 
 use std::io::Cursor;
 use std::io::copy;
-use std::io::Write;
 
 use std::sync::Arc;
 use std::sync::Mutex;
@@ -47,6 +47,9 @@ pub enum InstallMessage {
 /// etc.
 pub struct InstallerFramework {
     config: Config,
+    database: Vec<LocalInstallation>,
+    install_path: Option<String>,
+    preexisting_install: bool
 }
 
 /// Used to track the amount of data that has been downloaded during a HTTP request.
@@ -83,13 +86,21 @@ impl InstallerFramework {
     }
 
     /// Sends a request for something to be installed.
+    /// items: Array of named packages to be installed
+    /// messages: Channel used to send progress messages
+    /// fresh_install: If the install directory must be empty
     pub fn install(
-        &self,
+        &mut self,
         items: Vec<String>,
-        path: &str,
         messages: &Sender<InstallMessage>,
+        fresh_install: bool
     ) -> Result<(), String> {
-        // TODO: Error handling
+        // We have to have a install path for us to be able to do anything
+        let path = match self.install_path.clone() {
+            Some(v) => v,
+            None => return Err(format!("No install directory for installer"))
+        };
+
         println!("Framework: Installing {:?} to {}", items, path);
 
         // Create our install directory
@@ -106,13 +117,15 @@ impl InstallerFramework {
         }
 
         // Make sure it is empty
-        let paths = match read_dir(&path) {
-            Ok(v) => v,
-            Err(v) => return Err(format!("Failed to read install destination: {:?}", v)),
-        };
+        if fresh_install {
+            let paths = match read_dir(&path) {
+                Ok(v) => v,
+                Err(v) => return Err(format!("Failed to read install destination: {:?}", v)),
+            };
 
-        if paths.count() != 0 {
-            return Err(format!("Install destination is not empty."));
+            if paths.count() != 0 {
+                return Err(format!("Install destination is not empty."));
+            }
         }
 
         // Resolve items in config
@@ -126,12 +139,12 @@ impl InstallerFramework {
 
         println!("Resolved to {:?}", to_install);
 
+        // TODO: Uninstall pre-existing packages
+
         // Install packages
         let mut count = 0.0 as f64;
         let max = to_install.len() as f64;
 
-        let mut installed_packages = Vec::new();
-
         for package in to_install.iter() {
             let base_package_percentage = count / max;
             let base_package_range = ((count + 1.0) / max) - base_package_percentage;
@@ -165,6 +178,8 @@ impl InstallerFramework {
                 Err(v) => return Err(format!("An error occured while compiling regex: {:?}", v)),
             };
 
+            println!("Releases: {:?}", results);
+
             // Find the latest release in here
             let latest_result = results
                 .into_iter()
@@ -304,7 +319,8 @@ impl InstallerFramework {
             }
 
             // Save metadata about this package
-            installed_packages.push(LocalInstallation {
+            // TODO: Check if this package already exists
+            self.database.push(LocalInstallation {
                 name: package.name.to_owned(),
                 version: latest_version,
                 files: installed_files,
@@ -313,22 +329,7 @@ impl InstallerFramework {
             count += 1.0;
         }
 
-        // Make copy of metadata
-        // TODO: Combine with already installed database, if needed
-        let metadata_compiled = serde_json::to_string(&installed_packages).unwrap();
-
-        {
-            let metadata_path = path.join("metadata.json");
-            let mut metadata_file = match File::create(metadata_path) {
-                Ok(v) => v,
-                Err(v) => return Err(format!("Unable to open file handle: {:?}", v)),
-            };
-
-            match metadata_file.write_all(metadata_compiled.as_bytes()) {
-                Ok(v) => v,
-                Err(v) => return Err(format!("Unable to write to file: {:?}", v)),
-            };
-        }
+        self.save_database()?;
 
         // Copy installer binary to target directory
         messages
@@ -369,8 +370,63 @@ impl InstallerFramework {
         Ok(())
     }
 
+    /// Saves the applications database.
+    pub fn save_database(&self) -> Result<(), String> {
+        // We have to have a install path for us to be able to do anything
+        let path = match self.install_path.clone() {
+            Some(v) => v,
+            None => return Err(format!("No install directory for installer"))
+        };
+
+        let metadata_path = Path::new(&path).join("metadata.json");
+        let metadata_file = match File::create(metadata_path) {
+            Ok(v) => v,
+            Err(v) => return Err(format!("Unable to open file handle: {:?}", v)),
+        };
+
+        match serde_json::to_writer(metadata_file, &self.database) {
+            Ok(v) => v,
+            Err(v) => return Err(format!("Unable to write to file: {:?}", v)),
+        };
+
+        Ok(())
+    }
+
+    /// Configures this installer to install to the specified location.
+    /// If there was a currently configured install path, this will be left as-is.
+    pub fn set_install_dir(&mut self, dir : &str) {
+        self.install_path = Some(dir.to_owned());
+    }
+
     /// Creates a new instance of the Installer Framework with a specified Config.
     pub fn new(config: Config) -> Self {
-        InstallerFramework { config }
+        InstallerFramework {
+            config,
+            database : Vec::new(),
+            install_path : None,
+            preexisting_install : false
+        }
+    }
+
+    /// Creates a new instance of the Installer Framework with a specified Config, managing
+    /// a pre-existing installation.
+    pub fn new_with_db(config: Config, install_path : String) -> Result<Self, String> {
+        let metadata_path = Path::new(&install_path).join("metadata.json");
+        let metadata_file = match File::open(metadata_path) {
+            Ok(v) => v,
+            Err(v) => return Err(format!("Unable to open file handle: {:?}", v)),
+        };
+
+        let database : Vec<LocalInstallation> = match serde_json::from_reader(metadata_file) {
+            Ok(v) => v,
+            Err(v) => return Err(format!("Unable to read metadata file: {:?}", v)),
+        };
+
+        Ok(InstallerFramework {
+            config,
+            database,
+            install_path : Some(install_path),
+            preexisting_install : true
+        })
     }
 }
diff --git a/src/main.rs b/src/main.rs
index 41607ba..e95f601 100644
--- a/src/main.rs
+++ b/src/main.rs
@@ -38,6 +38,7 @@ use config::Config;
 use installer::InstallerFramework;
 
 use rest::WebServer;
+use std::path::Path;
 
 // TODO: Fetch this over a HTTP request?
 static RAW_CONFIG: &'static str = include_str!("../config.toml");
@@ -47,7 +48,12 @@ fn main() {
 
     let app_name = config.general.name.clone();
 
-    let framework = InstallerFramework::new(config);
+    let metadata_file = Path::new("metadata.json");
+    let framework = if metadata_file.exists() {
+        InstallerFramework::new_with_db(config, format!("./")).unwrap()
+    } else {
+        InstallerFramework::new(config)
+    };
 
     let server = WebServer::new(framework).unwrap();
 
diff --git a/src/rest.rs b/src/rest.rs
index b1c622b..6e7b9b8 100644
--- a/src/rest.rs
+++ b/src/rest.rs
@@ -31,6 +31,7 @@ use assets;
 
 use installer::InstallerFramework;
 use installer::InstallMessage;
+use std::sync::RwLock;
 
 #[derive(Serialize)]
 struct FileSelection {
@@ -63,7 +64,7 @@ impl WebServer {
         let (sender, receiver) = channel();
 
         let handle = thread::spawn(move || {
-            let shared_framework = Arc::new(framework);
+            let shared_framework = Arc::new(RwLock::new(framework));
 
             let server = Http::new()
                 .bind(&addr, move || {
@@ -89,7 +90,7 @@ impl WebServer {
 
 /// Holds internal state for Hyper
 struct WebService {
-    framework: Arc<InstallerFramework>,
+    framework: Arc<RwLock<InstallerFramework>>,
 }
 
 impl Service for WebService {
@@ -104,9 +105,11 @@ impl Service for WebService {
             // This endpoint should be usable directly from a <script> tag during loading.
             // TODO: Handle errors
             (&Get, "/api/config") => {
+                let framework = self.framework.read().unwrap();
+
                 let file = enscapsulate_json(
                     "config",
-                    &self.framework.get_config().to_json_str().unwrap(),
+                    &framework.get_config().to_json_str().unwrap(),
                 );
 
                 Response::<hyper::Body>::new()
@@ -133,7 +136,8 @@ impl Service for WebService {
             }
             // Returns the default path for a installation
             (&Get, "/api/default-path") => {
-                let path = self.framework.get_default_path();
+                let framework = self.framework.read().unwrap();
+                let path = framework.get_default_path();
 
                 let response = FileSelection { path };
 
@@ -150,7 +154,7 @@ impl Service for WebService {
             }
             (&Post, "/api/start-install") => {
                 // We need to bit of pipelining to get this to work
-                let cloned_element = self.framework.clone();
+                let framework = self.framework.clone();
 
                 return Box::new(req.body().concat2().map(move |b| {
                     let results = form_urlencoded::parse(b.as_ref())
@@ -180,7 +184,11 @@ impl Service for WebService {
 
                     // Startup a thread to do this operation for us
                     thread::spawn(move || {
-                        match cloned_element.install(to_install, &path, &sender) {
+                        let mut framework = framework.write().unwrap();
+
+                        framework.set_install_dir(&path);
+
+                        match framework.install(to_install, &sender, true) {
                             Err(v) => sender.send(InstallMessage::Error(v)).unwrap(),
                             _ => {}
                         }
diff --git a/static/index.html b/static/index.html
index 851ae30..25f3415 100644
--- a/static/index.html
+++ b/static/index.html
@@ -36,7 +36,7 @@
                     <div class="column" v-if="has_error">
                         <h4 class="subtitle">An error occurred:</h4>
 
-                        <pre><code>{{ error }}</code></pre>
+                        <code>{{ error }}</code>
 
 
                         <a class="button is-primary is-pulled-right" v-on:click="back_to_packages">Back</a>
@@ -147,7 +147,6 @@
                     results["path"] = this.install_location;
 
                     stream_ajax("/api/start-install", function(line) {
-                        console.log(line);
                         if (line.hasOwnProperty("Status")) {
                             app.progress_message = line.Status[0];
                             app.progress = line.Status[1] * 100;
diff --git a/static/js/helpers.js b/static/js/helpers.js
index bce23e0..d9fdc43 100644
--- a/static/js/helpers.js
+++ b/static/js/helpers.js
@@ -84,6 +84,8 @@ function stream_ajax(path, callback, successCallback, failCallback, data) {
                     continue;
                 }
 
+                console.log("Incoming line: " + line);
+
                 var contents = JSON.parse(line);
                 callback(contents);
             }