Alex Ruben
How To Install FitGirl Games Seamlessly in 2025 for All Titles
Trying to get those FitGirl Repack games installed without running into errors like ISDone.dll or Unarc.dll can be kinda frustrating. Sometimes even fresh installs decide to throw a fit, especially if your antivirus or Windows security is playing gatekeeper. If you’ve been fighting with failed setups or crashing mid-install, this walkthrough should help smooth things out. Expect fewer headaches, and maybe actually get to play that game you’ve been eagerly awaiting.
How to Fix Common Install Issues with FitGirl Repacks
Method 1: Disable Antivirus & Tweaking Windows Defender Settings
The most common troublemaker is Windows Defender or any antivirus that’s overly zealous. On some machines, Windows Security thinks the repacked game files are malware, so it blocks or deletes parts of the install. Disabling real-time protection temporarily can help. Just remember to turn it back on afterward, because of course Windows has to make it harder than necessary.
- Go to Settings > Privacy & Security > Windows Security.
- Select Virus & threat protection.
- Click on Manage settings under the Virus & threat protection settings.
- Turn off Real-time protection (toggle switch). This helps prevent Windows from blocking files during setup. On some setups, this fails the first time, then works after a reboot, so don’t sweat it if it’s a bit flaky.
This move is usually enough to let the game files install without Windows intervening. Always remember to re-enable real-time protection after the installation — just to keep things safe.
Method 2: Run as Administrator & Use Compatibility Mode
If disabling Windows Security didn’t do the trick, try running the setup file with admin rights and in compatibility mode. Sometimes, the installer throws a tantrum because it’s a bit old or needs elevated privileges. On one setup it worked, on another it just refused until I ran it as admin.
- Right-click the setup file > select Properties.
- Go to the Compatibility tab.
- Check Run this program as an administrator.
- If necessary, set compatibility to an older Windows version, like Windows 8.
- Click Apply and then OK.
- Double-click the setup again and see if it proceeds better.
This tweak can help with permissions issues that block decompression or file writing, especially on Windows 11 systems trying to be too smart.
Method 3: Use a Different Extraction Tool & Check Disk Space
Sometimes, the extraction process itself gets corrupted if your compressed files are weird or if an extraction program is flaky. Switch from WinRAR to 7-Zip (or vice versa), or use a fresh download if you suspect corruption.
- Download and install 7-Zip if you haven’t already.
- Right-click the game archive > choose 7-Zip > Extract to folder.
- Make sure you have enough disk space — at least 50 GB free, just to be safe. Running out of space can cause incomplete extraction, triggering errors during install.
One tricky part is making sure the drive isn’t fragmented or full, as that can corrupt files during extraction. On some drives, there’s weird caching behavior, so point to a different drive if you’re hitting constant errors.
Method 4: Fixing the ISDone.dll and Unarc.dll Errors
If those error messages pop up, especially during decompression, they usually point to corrupted downloads or insufficient RAM. Here’s where to look:
- Make sure your .rar or .7z files are fully downloaded. Try verifying the file hashes if possible.
- Close background apps, especially those that use lots of RAM — freeing up at least 4-8 GB RAM helps on some setups.
- Run the installer from the extracted folder, not the archive.
- If errors persist, consider using a tool like Winhance to tweak or repair the decompression process.
On some machines, running the installer as administrator or increasing virtual RAM (via System Properties > Advanced > Performance Settings > Virtual memory) can smooth out the process. Because Windows loves to make things complicated.
Extra Tips & Common Issues
- Update your graphics card drivers — outdated drivers can cause weird performance or even install crashes.
- If install files keep failing, re-download from the original source — sometimes, downloads get corrupted leftover bits that get stubborn during decompression.
- Check online forums or the FitGirl Repack community; some issues are common, and someone might’ve already posted a simple fix.
Wrap-up
Getting FitGirl Repack games installed without hiccups can be a combo of disabling security, running setup as admin, and making sure your files are good. Sometimes, it’s just a matter of trial and error, but these steps cover most of the common issues. Fingers crossed this helps — it worked for me a few times now, so maybe it’ll help you dodge some headaches too.
Summary
- Temporarily disable Windows Security real-time protection.
- Run setup as administrator & in compatibility mode.
- Use 7-Zip for extraction, verify download integrity.
- Address DLL errors by checking RAM and re-downloading files.
- Remember to re-enable security after installing.