Alex Ruben
How To Fix FitGirl Repack Installation Errors and Avoid ISDone.dll and Unarc.dll Issues
If you’ve ever tried installing a FitGirl Repack game and hit a wall with errors like ISDone.dll or Unarc.dll popping up, you’re not alone. Sometimes, these errors can be super frustrating because they basically kill the install process dead in its tracks. Usually, it’s because of system hiccups, missing system files, or interference from security measures—like Windows Defender—trying to be ‘helpful’ but actually messing things up. The good news is, there are some tried-and-true methods to fix this without having to wipe everything and start from scratch. Following these steps can make the install smoother, and keep your game downloads from failing halfway through.
How to Fix ISDone.dll and Unarc.dll Errors When Installing FitGirl Repack Games
Disable Real-time Protection in Windows Security
This is often the first step because Windows Defender or other antivirus components tend to throw a fit when the installer is working hard to unpack big files. Disabling real-time protection helps avoid accidental interference that could corrupt the archive extraction process or cause errors like ISDone.dll. You should do this only temporarily, though—because Windows is a bit paranoid these days.
- Open the Start Menu and type
Windows Securitythen hit enter. - Navigate to Virus & threat protection.
- Click on Manage settings under the Virus & threat protection settings.
- Turn off Real-time protection. You might get a warning, but that’s OK; just confirm it.
This step helps prevent the OS from interfering during large file extraction or setup—especially when the error suddenly pops up during those critical moments.
Start the Installation Process
Once the real-time protection is off, it’s time to kick off the installation. Not much magic here, but a few tips can prevent some common pitfalls.
- Find your game’s setup file (usually in your Downloads or extracted folder) and double-click it.
- If Windows pops up a UAC prompt, click Yes.
- Select your language and click OK.
- On some setups, you might see options like Limit installer to 2 GB of RAM usage. If you’re low on RAM (<8 GB), check that box—sometimes it helps avoid overloading your system during install.
- Make sure no other heavy apps are running in the background—these can cause resource conflicts.
- Then hit Next to move forward.
Choose the Installation Location Carefully
This is a minor, but sometimes important step. Installing to a location with plenty of free space and good permissions can prevent errors related to file access or disk I/O.
- Click Browse—pick a folder like C:\Games\MyGame or wherever you want.
- Ensure there’s enough space (at least 20-30 GB, depending on the game).
- Click Next.
Select Voiceover Languages (if applicable)
Some installs allow you to pick language packs. Uncheck what you don’t need because unnecessary files can increase installation time or cause errors if they’re corrupted.
- Choose your preferred languages.
- Click Install.
Adding the Game Folder to Windows Security Exclusions
If the game installs fine but crashes later or errors keep popping, adding the installed folder to Windows Defender’s exclusions can help prevent false positives or interference during runtime.
- Open Windows Security again, navigate to Virus & threat protection.
- Click on Add or remove exclusions.
- Choose Add an exclusion > Folder.
- Navigate to your game folder, for example
C:\Games\MyGame, and select it. - Click Select Folder.
Re-enable Real-time Protection
This is kinda important because leaving your system unprotected isn’t safe. After you’ve added exclusions, turn real-time protection back on so your system stays secure from malware that might try to sneak in.
- Go back to Manage settings in Windows Security.
- Toggle Real-time protection back on.
Install Any Missing System Components
Sometimes, errors are caused by missing Visual C++ Redistributables or outdated DirectX files. The installer might prompt you to install these, or you might need to do it manually.
- Run the Visual C++ Redistributables installer from the official Microsoft website: Latest Visual C++ Redistributables.
- Install both x86 and x64 versions if prompted. Sometimes the game won’t install properly without them.
- If you see errors about existing versions, just close those windows—nothing to stress over.
Extra Tips & Troubleshooting
If errors keep showing up despite these steps, a few other tricks might help:
- Double-check you have enough free disk space—errors often pop up if your drive’s nearly full.
- Make sure Windows is fully updated (check Settings > Update & Security).
- If you still get errors after all that, temporarily disable other antivirus or Windows Defender overlays—sometimes they conflict especially during large file unpacking.
- And, of course, on some setups, a simple reboot after making these changes can fix lingering issues.
Wrap-up
Basically, these steps cover most of the common causes behind ISDone.dll and Unarc.dll errors during game installs. It’s sometimes a mix of security interference, corrupted downloads, or missing system files. The trick is to disable protections long enough to get the installer done, then make sure to re-enable everything afterward. Experimenting with folder exclusions and installing missing components often does the trick—no need to get crazy or wipe your system.
Frequently Asked Questions
What do I do if installation still fails after these steps?
Try verifying your game files or redownloading the archive. Sometimes bad downloads are the root cause. Also, check system requirements again—if your PC is borderline, errors like these can crop up more often.
Can I completely disable antivirus software permanently?
Not recommended. It’s safer to disable it temporarily during installation, then re-enable it once everything’s done. Windows Defender is fine if you turn it back on afterward.
Are there other tools that can help fix these errors?
Tools like Winhance can sometimes optimize your Windows settings for gaming and large file operations, but most of the time, following these steps is enough to get rid of those pesky DLL errors. Just keep your system updated, and don’t forget to re-enable protections afterward.
Summary
- Disable Windows Defender real-time protection before starting the install
- Run the installer as administrator
- Add game folder to exclusions
- Install any missing system components (VC++, DirectX)
- Re-enable protection and do a reboot if needed
Hopefully, this shaves off a few hours of debug time. Good luck, and may your install finally go smoothly!