Discord Setup: Installation Has Failed -- How to Fix It

Tech & Gaming
1

The “Installation has failed” error when trying to install Discord is almost always caused by leftover files from a previous Discord installation conflicting with the new one. Here’s the reliable fix.

The main cause

Discord stores files in multiple locations on Windows. When an installation fails or is incompletely uninstalled, remnants stay behind. When you try to reinstall, the installer encounters these files and fails. The fix is to completely remove all Discord remnants before reinstalling.

Complete removal and clean reinstall

  1. Uninstall Discord via Windows Settings: Settings > Apps > find Discord > Uninstall. If Discord isn’t listed, skip this step.

  2. Kill any running Discord processes: Open Task Manager (Ctrl + Shift + Esc), look for any Discord processes, and end them all.

  3. Delete remaining Discord folders:

    Press Windows + R and open each of these paths, deleting the Discord folder inside each if it exists:

    • %AppData% – look for a “Discord” folder and delete it
    • %LocalAppData% – look for a “Discord” folder and delete it
    • %LocalAppData%\SquirrelTemp – delete this entire folder if it exists

  4. Restart your PC

  5. Download a fresh installer from discord.com and run it

This clears all remnants and gives the installer a clean environment to work with. It resolves the installation failure in the vast majority of cases.

If the clean reinstall still fails

Run as administrator: Right-click the Discord installer > Run as administrator. Some installation paths require elevated permissions that a normal user launch doesn’t provide.

Antivirus interference: Some antivirus programs block Discord’s installer, particularly the SquirrelSetup component Discord uses. Temporarily disable real-time protection, run the installer, then re-enable protection.

Windows Installer service: Press Windows + R > type services.msc > find “Windows Installer” > right-click > Restart. Then try the installer again.

Check available disk space: Discord needs a few hundred MB of free space. If your drive is nearly full, the installer may fail silently.

Discord Canary as an alternative

If the standard installer continues to fail, Discord Canary (Discord’s alpha build, available at discord.com/canary) uses a different installer path and sometimes succeeds where the standard installer doesn’t.

2

the AppData cleanup is the fix. every time discord gives me install issues the answer is deleting the leftover folders in %appdata% and %localappdata%. the installer fails because it finds files it doesn’t expect. clear them out and it installs clean. should be step one not buried at the end of troubleshooting guides.

3

SquirrelTemp is the one that often gets missed. people delete the AppData discord folder but leave SquirrelTemp and the install still fails. deleting all three locations is important.

4

The antivirus blocking SquirrelSetup is a real and common cause that doesn’t generate an obvious error message. The installer just fails without explaining why. If you’ve done the full cleanup and it still fails, temporarily disabling AV before running the installer is worth trying before more complex fixes.