Alex Ruben
How To Install FitGirl Repack Games Smoothly Without Errors (2025 Guide)
If you’ve ever tried to install a FitGirl repack and hit walls with errors like ISDone.dll or Unarc.dll, you’re not alone. Sometimes Windows security feels like it’s working against you, blocking the unpacking or execution of files, especially with larger games. This guide is about punching through those roadblocks, making sure your installation process actually completes without crashing or error messages.
It’s kinda weird, but fiddling around with Windows Security settings, exclusions, and a few tweaks usually does the trick. Expect some trial and error, and a little patience. The goal here is to get the game installed, and then trust that it’ll run smoothly afterward. Because of course, Windows has to make it harder than necessary sometimes. If this helps avoid errors and actually gets you to play without fuss, then it’s a win.
How to Fix Common FitGirl Installation Errors in Windows 10 & 11
Disable Real-Time Protection in Windows Security
This is the classic move. Real-time protection can get stuck blocking or corrupting parts of the setup, especially with compressed files from FitGirl. Not sure why it works, but on some setups, turning off Windows Defender during install helps, then remembered once you finish, re-enable it, or it might block other apps later.
- Open the Start Menu and type
Windows Security, then hit Enter. - Go to Virus & threat protection.
- Click on Manage settings.
- Toggle off Real-time protection. Confirm with Yes if prompted.
On some machines, this isn’t enough the first time—you might need to restart your PC after toggling this off. Windows being Windows, of course.
Launch and Run the Setup as Admin
Now that you’ve disabled real-time protection, try running the installer with admin rights. Sometimes, permissions or antivirus defenses interfere with extracting or executing files.
- Right-click the setup file, select Run as administrator.
- If prompted by UAC, click Yes.
- Follow the usual prompts—choose language, destination, etc.
This momentary elevation can help bypass some Windows security quirks or permissions issues, especially with large unpacking tasks.
Adjust Installation Location & Folder Permissions
If the game is set to install somewhere tricky (like a network drive or a folder with tight permissions), it might puke. Best to install in a simple folder like C:\Games\[Game Name].
- Create a folder manually if needed, like C:\Games\YourGame.
- Right-click the folder, select Properties.
- Go to the Security tab, check permissions, and ensure your user has full control.
- Select the install folder during setup.
Sometimes Windows guards folders or blocks writes, especially if user permissions are weird. Fixing permissions often resolves pesky errors.
Add the Game Folder to Windows Security Exclusions
This is crucial. If Windows Security is obstructing the game files during unpacking or launch, adding the folder to exclusions stops it from scanning and blocking files during installation or after.
- Open Windows Security.
- Scroll down and click Add or remove exclusions.
- Click Yes if prompted for permission.
- Choose Add an exclusion > Folder.
- Navigate to your game folder (like
C:\Games\[Game Name]) and select it. - Verify that the folder now shows up in the exclusions list.
- Finally, re-enable Real-time protection if you disabled it before.
This step often makes the biggest difference—Windows doesn’t tend to interfere with files in the excluded folder, which helps avoid errors popping up during extraction or launching.
Run the Game Installer and First Launch
Once exclusions are set, run the setup again (preferably as admin). Hopefully, it installs smoothly without errors. Check for any missing files at this point, especially if errors like ISDone.dll reappear.
- Complete the installation and uncheck “launch now” if it asks.
- Finish and wait for the game folder to settle.
When you first launch, keep an eye out for any missing DLLs or errors. If all good, you’re in the clear!
Extra Tips & Common Troubleshooting
Sometimes, errors still pop up, or the game refuses to run. Here’s what else might help:
- Check the game’s folder for corrupt or incomplete files. Running a file integrity check (if available) can help.
- If you get errors related to missing DLLs, verify that your Visual C++ redistributables are up-to-date. You can grab the latest from the official Microsoft website.
- Make sure your Windows is fully updated. Compatibility issues often delay or break game runs.
- If errors like “unable to execute file” happen, double-check that your antivirus isn’t blocking the game after exclusions are added. Sometimes it still flags suspicious behavior.
Wrap-up
This whole process can be a bit frustrating, but once those security settings are adjusted, most games install without those nasty errors popping up. The key seems to be in throwing Windows Security into a more permissive mode—adding exclusions and turning off real-time scanning temporarily. Things like running the setup as administrator also help avoid permission issues. After all the fiddling, if the game launches and runs fine, then all the hassle is worth it.
Summary
- Disable Real-Time Protection temporarily
- Run setup as administrator
- Install in a simple folder like C:\Games
- Add game folder to Windows Security exclusions
- Re-enable real-time protection after install