diff --git a/app.js b/app.js
index 4956cf6..5569b99 100644
--- a/app.js
+++ b/app.js
@@ -29,6 +29,13 @@ const run = () => {
         app.on('window-all-closed', () => {
             app.quit()
         })
+        ipcMain.handle('launch', async () => {
+            const result = await osuUtil.startOsuWithDevServer(tempOsuPath, "ez-pp.farm", async () => {
+                await doUpdateCheck(mainWindow);
+            });
+            console.log(result);
+            return result;
+        })
         ipcMain.on('do-update-check', async () => {
             await doUpdateCheck(mainWindow);
         })
diff --git a/executeUtil.js b/executeUtil.js
new file mode 100644
index 0000000..cb5d5ae
--- /dev/null
+++ b/executeUtil.js
@@ -0,0 +1,18 @@
+const childProcess = require('child_process');
+module.exports = {
+    runFile: (folder, file, args, onExit) => {
+        childProcess.execFile(file, args, {
+            cwd: folder
+        }, (_err, _stdout, _stderr) => {
+            onExit();
+        });
+    },
+    runFileDetached: (folder, file, args) => {
+        const subprocess = childProcess.spawn(file + " " + args, {
+            cwd: folder,
+            detached: true,
+            stdio: 'ignore'
+        })
+        subprocess.unref()
+    }
+}
\ No newline at end of file
diff --git a/osuUtil.js b/osuUtil.js
index a7c909f..be13ea3 100644
--- a/osuUtil.js
+++ b/osuUtil.js
@@ -3,6 +3,7 @@ const fu = require('./fileUtil');
 const path = require('path');
 const crypto = require('crypto');
 const axios = require('axios').default;
+const executeUtil = require('./executeUtil');
 const { EventEmitter } = require('events');
 const { DownloaderHelper } = require('node-downloader-helper');
 
@@ -122,7 +123,7 @@ async function downloadUpdateFiles(osuPath, filesToUpdate) {
         const filePath = path.join(osuPath, fileToUpdate.fileName);
         if (await fu.existsAsync(filePath))
             await fs.promises.rm(filePath);
-        
+
         const fileDownload = new DownloaderHelper(fileToUpdate.fileURL, osuPath, {
             fileName: fileToUpdate.fileName,
             override: true,
@@ -139,4 +140,12 @@ async function downloadUpdateFiles(osuPath, filesToUpdate) {
     return eventEmitter;
 }
 
-module.exports = { isValidOsuFolder, getLatestConfig, getUpdateFiles, filesThatNeedUpdate, downloadUpdateFiles }
\ No newline at end of file
+async function startWithDevServer(osuPath, serverDomain, onExit) {
+    const osuExe = path.join(osuPath, "osu!.exe");
+    console.log(osuExe);
+    if (!await fu.existsAsync(osuExe)) return false;
+    executeUtil.runFile(osuPath, osuExe, ["-devserver", serverDomain], onExit);
+    return true;
+}
+
+module.exports = { isValidOsuFolder, getLatestConfig, getUpdateFiles, filesThatNeedUpdate, downloadUpdateFiles, startOsuWithDevServer: startWithDevServer }
\ No newline at end of file
diff --git a/preload/preload.js b/preload/preload.js
index 303b99e..d2a9c49 100644
--- a/preload/preload.js
+++ b/preload/preload.js
@@ -20,7 +20,22 @@ window.addEventListener('DOMContentLoaded', () => {
     $("#launch-btn").on('click', async () => {
         switch (currentState) {
             case "up-to-date":
-                //TODO: launch client
+                $("#launch-btn").attr('disabled', true);
+                $('#launch-btn').html('Launching...');
+                const result = await ipcRenderer.invoke("launch");
+                if (!result) {
+                    Swal.fire({
+                        title: 'Uh oh!',
+                        text: "Something went wrong while launching!",
+                        icon: 'error',
+                        confirmButtonText: 'Okay'
+                    });
+                    $("#launch-btn").attr('disabled', false);
+                    $('#launch-btn').html('Launch');
+                } else {
+                    $("#launch-btn").attr('disabled', true);
+                    $('#launch-btn').html('Running...');
+                }
                 break;
             case "update-available":
                 $("#launch-btn").attr('disabled', true);