Alex Ruben
How To Fix ISDone.dll, Unarc.dll, and Setup Not Opening for Easy FitGirl Repack Installation
Maybe you’ve run into those annoying errors during game setup, especially with FitGirl repacks — like ISDone.dll or Unarc.dll issues. Honestly, these errors can be a pain, kind of weird because they seem unrelated but are caused by certain system or security settings messing with the unpack process. Usually, it’s because of corrupted temporary files, antivirus interference, or not enough RAM. This guide walks through some practical steps to get past these errors and get your game installed without tearing your hair out.
How to Fix ISDone.dll and Unarc.dll Errors While Installing FitGirl Repack Games
Method 1: Disable Windows Security Temporarily
Windows Security (or Windows Defender) sometimes freaks out and blocks parts of the unpacking process. Disabling real-time protection temporarily can help. Not sure why it works, but on some setups, it’s like Windows gets paranoid and stops the installer from writing files properly, which triggers these errors. After you’re done, don’t forget to turn it back on — gotta keep your system safe, right?
- Press the Windows key and type Windows Security, then hit Enter.
- Click on Virus & threat protection.
- Under Virus & threat protection settings, click on Manage settings.
- Toggle off Real-time protection. If prompted, confirm with admin rights.
Once turned off, rerun the installation. Sometimes, it’s just that simple and works the first time, but on other machines, you gotta restart or try running the installer as admin.
Method 2: Clear Temporary Files and Check Disk Space
This may seem obvious, but making sure your temp folders are squeaky clean, and that your drive has enough space, can fix strange errors. Often, ISDone.dll throws a fit because it runs out of space or hits corrupted temp files.
- Press Win + R, type
tempand hit Enter. Delete everything inside. - Do the same for
C:\Windows\Temp. - Check your disk space in This PC; aim for at least 20–30 GB free if possible.
- Run Disk Cleanup to remove system junk.
This cleanup helps prevent file corruption during extraction, and it’s an easy fix most forget to do. For some, just freeing up space sorted the issue right away.
Method 3: Increase RAM or Adjust Virtual Memory
If your PC’s RAM is under 8 GB, or if your system runs tight, you may face issues during unpacking big files. Basically, the system runs out of memory, and that’s when these DLL errors pop up. Increasing virtual memory (page file) can sometimes fix that. Not sure why, but many users report this helped — especially on older or low-spec PCs.
- Go to Settings > System > About > Advanced system settings.
- In the System Properties window, click Settings under Performance.
- Switch to the Advanced tab and click Change under Virtual memory.
- Uncheck Automatically manage paging file size for all drives.
- Select your main drive (usually C:), then choose Custom size.
- Set the Initial size and Maximum size to about 1.5–2 times your RAM (e.g., for 4GB RAM, try 6144 MB).
- Click Set and OK your way out. Restart your PC for changes to take effect.
This isn’t a guarantee, but on some setups, it helped smooth out those unpacking crashes that cause DLL errors.
Method 4: Add Your Game Folder to Antivirus Exclusions
Because of course, Windows has to make it harder than necessary. Antivirus programs can block or quarantine the files the installer is unpacking, leading to those DLL errors. Adding the game folder to your exclusions list keeps them out of trouble.
- Open Windows Security again.
- Head to Virus & threat protection > Manage settings > Add or remove exclusions.
- Click Add an exclusion and pick Folder.
- Navigate to where you’re installing the game (
C:\Games\YourGameFolder) and select it.
On some setups, this prevents the installer from hitting walls due to false positives, and the DLL errors stop happening.
Method 5: Run the Installer as Admin and check for corrupt files
Running the setup with admin rights ensures it has the permissions needed to write files properly — because Windows sometimes blocks access without telling you. Also, double-check that your game files aren’t corrupt or incomplete. Re-downloading might be necessary if errors persist.
- Right-click the installer file and select Run as administrator.
- If errors still pop up, try downloading the archive again from a trusted source, or check the checksum if available.
Sometimes, these errors are caused by bad files, not your system settings. It’s a pain, but re-downloading isn’t a bad idea if nothing else works.
Extra Tips & Common Issues
If errors keep showing, verify that your system isn’t running weird background programs or antivirus that’s still active. Also, manually install any missing components like DirectX, Visual C++, or .NET frameworks, which sometimes need to be updated for the game to run smoothly.
Look out for error codes or logs if available. Forums or dedicated sites often have specific fixes for particular DLL errors, especially if it’s related to a certain Windows build or driver issue.
Wrap-up
Getting past ISDone.dll and Unarc.dll errors usually involves a mix of disabling unnecessary protections, freeing up system resources, and making sure your setup files are good to go. Sometimes, it’s just a matter of patience and trying a few different things — especially if the first one doesn’t work. But with these steps, there’s a good chance to unblock the main issues and finally get those games installed.
Summary
- Disable Windows Security temporarily before installation.
- Clear temp folders and check disk space.
- Increase virtual memory if RAM is low.
- Add game folder to antivirus exclusions.
- Run installer as administrator and ensure files aren’t corrupt.
Frequently Asked Questions
What if errors still happen after trying all these?
Double-check your game files — maybe re-download — and ensure your Windows is fully updated. Sometimes, system file errors or outdated drivers trigger these DLL issues, so running sfc /scannow in Command Prompt (Admin) can help fix corrupted system files.
Can I re-enable antivirus immediately after installing?
Yeah, just be sure you added the game folder before turning it back on. It’s a temporary measure, but leaving the exclusions afterwards helps prevent future hiccups.
Anything else to try if problems persist?
Look into updating your graphics drivers, or manually installing the latest DirectX and Visual C++ redistributables from Microsoft’s official site. Sometimes, these errors are a sign your system needs some TLC beyond just the installer.