Alex Ruben
How To Fix and Install FitGirl Repack That Won’t Install (2025)
Getting a FitGirl repack up and running isn’t always smooth sailing. Common headaches include errors like ISDone.dll, unpacking getting stuck, or weird pop-ups that make you want to smash your keyboard. This guide aims to cover the usual culprits and help straighten things out so you can jump into your games without pulling your hair out. Because, of course, Windows has to make it harder than it should be.
How to Fix FitGirl Repack Installation Issues
Method 1: Disable Windows Security Real-Time Protection
That annoying security overlay might be blocking some of the setup files from executing properly. Turning off real-time protection can help the installer do its thing without interference. Not sure why, but it seems to help—at least on some setups, it did. Be aware that disabling this temporarily can leave your PC vulnerable, so turn it back on after everything’s installed.
- Open the Start Menu and type
Windows Security. Click on it. - Navigate to Virus & Threat Protection.
- Click on Manage Settings under Virus & Threat Protection settings.
- Toggle off the Real-Time Protection. Confirm the prompt with Yes.
Once that’s done, run the installer again. Sometimes, on some machines, this needs to be done more than once. And yes, after installation, remember to turn real-time protection back on — because leaving it off isn’t exactly safe.
Method 2: Run the Installer as Administrator
This might seem obvious, but it’s easy to forget. Running the setup with admin rights helps ensure it can write to protected folders and handle registry entries. If you’re getting permission errors or the installer just isn’t working, this is worth trying.
- Right-click the setup file and select Run as administrator.
- Approve any UAC prompts, then proceed with the setup.
On some setups, this step fixes the “can’t write files” or “access denied” errors that pop up during installation. Because of course, Windows has to make it a pain to get the permissions right.
Method 3: Free Up System Space & Check Disk Health
If your disk is nearly full or bad sectors are lurking around, unpacking can hang or crash unexpectedly. Make sure you’ve got at least 10-20 GB free, especially if the game is big. You can run chkdsk /f /r from Command Prompt (as admin) to check your drive’s health for good measure. Sometimes, a quick cleanup with Disk Cleanup tool helps too.
- Open File Explorer.
- Right-click on your drive and select Properties.
- Click Disk Cleanup and include temporary files.
Should help prevent weird stalls during unpacking.
Method 4: Verify the Integrity of the Repack Files
If your archive files are corrupted or incomplete, installation might freeze or throw errors. Make sure your downloaded files are complete and intact. Some repack sources have checksum files; verify those with tools like HashCalc if available. Or re-download from a reliable source like the official tracker or mirror.
Method 5: Add Exclusions and Clear TEMP Files
Antivirus can get overly aggressive and block parts of the installation silently. Adding the game folder to your exclusion list in Windows Security helps, as mentioned before. Also, clear out temporary files that might interfere with unpacking.
- Open Windows Security > Virus & Threat Protection > Manage Settings.
- Scroll down to Add or Remove Exclusions.
- Click Add an Exclusion and pick Folder.
- Navigate to your game’s install folder (often in
C:\Games) and add it.
Additionally, clear the temp folder: press Win + R, type temp, hit Enter, select all, then delete. Same for %temp% in the Run box. Sometimes leftover temp files cause issues.
Method 6: Use Alternative Unpacker or Check for Compatibility
If unpacking stalls at 99% or aborts with errors, try running the unpack process with an alternative tool—like 7-Zip or WinRAR. Also, if your OS is a bit old or still on Windows 7/8, running the setup in compatibility mode (right-click > Properties > Compatibility) can help. Plus, ensure your drivers (especially GPU and chipset) are up to date, because outdated hardware can cause crashes during resource-heavy install steps.
Additional Tips & Common Issues
- If you see errors about missing files or DLLs like ISDone.dll, it usually hints at low RAM, fragmented disk, or corrupted setup files. Running the installer in Compatibility Mode, or temporarily disabling antivirus, can clear this up.
- Sometimes the unpacking process freezes because of a problematic temp folder. Clearing temp files and rerunning the setup can help.
- If after all that, you still get errors, check that your Windows is fully updated. Sometimes, just installing all pending updates helps avoid weird compatibility issues.
Wrap-up
Basically, fixing these kinds of issues involves a mix of turning off security, running as admin, checking disk health, verifying files, and occasionally tweaking compatibility. No single fix works for everyone, but these steps cover the most common hurdles. Maybe it’s not sexy, but it works — at least on most setups.
Summary
- Disable real-time protection temporarily.
- Run the installer as administrator.
- Keep enough free space and verify disk health.
- Check for corrupt download files or incomplete archives.
- Add game folder to exclusions in Windows Security.
- Try alternative unpackers or compatibility modes if needed.
Final thoughts
Hopefully, this shaves off a few hours of headache. Fixing install issues can be a pain, but often it’s just a matter of marginal tweaks. Good luck, and may your unpacking be smooth!