Alex Ruben
How To Achieve Fast and Error-Free FitGirl Game Installation on Windows (2025)
Getting FitGirl repack games set up without running into errors like ISDone.dll or unarc.dll can be a real pain, especially since Windows sometimes loves throwing unexpected popups or blocking stuff in the background. The goal here is to get the installation smooth and hassle-free, whether you’re on Windows 10 or 11. This involves toggling some security settings, making sure your system is ready, and setting up exclusions so Windows doesn’t freak out every time you try to launch the game. After these steps, you should be able to run your favorite games without endlessly troubleshooting those pesky errors that pop up because of security blocks or missing files. Not always perfect, but it’s a solid plan that’s worked for quite a few folks – at least on multiple setups, so hopefully this helps you avoid banging your head on the desk.
How to Fix Common Installation Errors with FitGirl Repack Games in Windows 11/10
Disable Windows Security Real-Time Protection to Avoid Interference
This is kind of weird, but Windows Security’s real-time protection can sometimes interfere with unpacking or installing large game files. When that happens, errors like ISDone.dll or unarc.dll pop up because Windows is mistakenly flagging high disk activity or some unpacking process as suspicious. Turning it off temporarily helps the installer go smoothly.
- Press Windows + S and type Windows Security. Open it.
- Click on Virus & threat protection.
- Select Manage settings under that section.
- Toggle off the Real-time protection. Confirm if prompted.
Do note, on some setups this might cause Windows to complain or turn it back on automatically after reboot, so keep that in mind. This fix applies if errors happen right when the unpacking starts or during installation. Expect that disabling security should only be temporary — don’t forget to turn it back on after everything’s installed.
Start the Installation as Administrator and Disable Antivirus if Needed
Sometimes, admin rights are a must because the installer needs to write files deep within system folders. Right-click the setup file and choose Run as administrator. Also, your antivirus might still be blocking certain actions, even with Windows Security turned off. If issues persist, temporarily disable the third-party antivirus tools or add the game folder to their exclusions.
- Right-click the setup file, select Run as administrator.
- Navigate to the folder where you downloaded the game, usually something like C:\Downloads\FitGirlRepack.
- If antivirus pops up, disable it temporarily — just remember to turn it back on later!
Set Up Exclusions for the Game Folder in Windows Security
This trick helped me avoid errors related to missing or inaccessible files during unpacking. Basically, tell Windows Security that this folder is safe, so it doesn’t interfere or scan during the critical installation window.
- Open Windows Security again.
- Scroll down to Add or remove exclusions.
- Click Add an exclusion > Folder.
- Pick your game folder, maybe C:\Games\YourGame.
- Confirm it’s added. Now, Windows should leave it alone.
This can solve weird errors like DLL issues and incomplete unpacking that happen when the antivirus or Windows Defender stops certain files from installing properly.
Increase Virtual Memory / Page File
If you keep getting ISDone.dll errors or installation hangs, that might be because your virtual memory (pagefile) setting isn’t enough. This is especially true on systems with less RAM (<8 GB).
- Go to Control Panel > System > Advanced system settings.
- Click on Settings under Performance.
- Go to the Advanced tab and click on Change in Virtual Memory.
- Uncheck Automatically manage paging file size for all drives if checked.
- Select your system drive (usually C:).
- Set the initial and maximum size to at least 4096 MB (4 GB), or more depending on your RAM.
- Click Set and reboot.
This isn’t always needed, but on some setups, bumping the virtual memory can make a difference with big unpacking processes and errors.
Installing Additional Software (DirectX & Visual C++ Redistributables)
Sometimes the game or repack needs certain DLL files from DirectX or Visual C++ Redistributables. These aren’t always bundled, and Windows might miss stuff, causing setup crashes or errors about missing DLLs.
- Download DirectX from Microsoft’s official site.
- Install the latest Visual C++ Redistributables from Microsoft Support.
- Reboot after installations — sometimes that’s all it takes to avoid DLL errors during game setup.
Running the Installer in Compatibility Mode
If the setup crashes or errors pop up on Windows 11, it might be worth trying compatibility mode for older systems like Windows 7 or 8. This sometimes helps with older repacks that aren’t fully tested on Windows 11.
- Right-click setup file, choose Properties.
- Navigate to the Compatibility tab.
- Check Run this program in compatibility mode for, then pick Windows 8 or Windows 7.
- Apply and try running the installer again.
If All Else Fails, Re-Download or Try Different Files
Sometimes the files are corrupted or incomplete. If errors keep popping up even after trying all these fixes, redownload the repack from a trusted source or try a different mirror. Because of course, nothing’s more frustrating than corrupt download files causing errors that seem like hardware or security issues.
Wrap-up
Getting past install errors with FitGirl repacks can be a pain in the backside, but fiddling with security, exclusions, and system settings often clears up most of it. Think of it like telling Windows to chill out while the game files do their thing. Just remember to turn security back on later — don’t leave your system totally exposed. This method has helped me get around most common errors, so hopefully, it saves you a few hours of head-scratching.
Summary
- Temporarily disable Windows Defender or third-party antivirus.
- Run installers as administrator and in compatibility mode if needed.
- Add your game folder to Windows Security exclusions.
- Increase virtual memory if facing DLL or ISDone.dll errors.
- Install missing Microsoft redistributables.
- Re-download the repack if errors persist.
Final Words
If this ended up fixing your errors, then all that fuss was worth it. For me, most issues clear up after setting exclusions and bumping virtual memory. Fingers crossed, this helps someone breeze through their setup without losing their mind.