Alex Ruben
How To Fix ISDone.dll and Unarc.dll Errors During Game Installation
If you’ve been trying to install a FitGirl repack game and keep running into errors like ISDone.dll, Unarc.dll, or missing files, it’s honestly a pain. Sometimes Windows or your firewall freaks out, or the installer just gets stuck. This guide walks through a few practical ways to fix those annoying errors, so you can actually get to playing without banging your head against the keyboard. Not every fix works on every machine, but desperate times call for desperate measures, right?
How to Fix Common Installation Errors with FitGirl Repack Games
Method 1: Disable Windows Defender & Real-Time Protection — Why it helps and when
This is one of the first things to try because Windows can really interfere with large extract/installation files. When the system’s real-time protection or antivirus thinks a file is malicious, it might block or delete parts of the installer, leading to errors like ISDone.dll or unarc.dll. Turning off real-time protection temporarily helps the installer complete without interference. Be aware though—once done, don’t forget to turn it back on, because malware is sneaky as hell.
- Open Start Menu → type
Windows Security - Click on Windows Security
- Navigate to Virus & threat protection
- Click on Manage settings
- Toggle off Real-time protection
On some setups, this might disable other key protections, but for the installation process, it seriously helps reduce conflicts. Once the install finishes, go back and turn it back on, or your PC will be more open to threats than it should be.
Method 2: Run the Installer as Administrator, Clean Boot, and Use Command Line Fixes — When stuff still fails
If the error pops up again after disabling protection, it’s worth running the installer with admin privileges. Right-click the setup file and pick Run as administrator. Also, consider doing a clean boot to eliminate background conflicts because Windows sometimes runs apps or services that block file access during install. This involves turning off non-essential startup programs via Task Manager → Startup.
Another trick that helped a couple of folks was using command line to clear temporary files:
del %temp%\* /s /q
rmdir %temp%Then, reboot, and try the install again. Sometimes Windows just stores junk that messes with large archives and extraction routines. A fresh start can do wonders.
Method 3: Manually extract files, increase virtual RAM, or fix install path issues — When errors persist after basic fixes
In some cases, the installer fails because of corrupt .part files or insufficient virtual memory. You can try this:
- Download and run a tool like Winhance or other archive repair tools to manually extract the contents.
- Increase your virtual memory by going to Control Panel → System → Advanced system settings → Performance → Settings → Advanced → Change. Enable “Automatically manage paging file size for all drives” or set a custom size higher, say 16GB for heavy installs.
- Ensure you’re installing to a local drive (preferably SSD) and not a network share or external drive, which can cause read/write errors.
Sometimes, just changing the install location from C:\Games\ to D:\Game\ or something similar helps bypass path length or permissions issues. Windows can be weird about folders deep in system directories.
Method 4: Reinstall Visual C++ Redistributables and Check Disk Space — For lingering library issues
Missing DLLs often point to outdated or broken Visual C++ redistribs. Head over to Microsoft’s latest Visual C++ redistributables and install/update them all. Reboot afterward. Also, double-check that you’ve got enough free disk space — like, at least 20GB free—because installers hate running out of space mid-extract.
Additional advice: Keep an eye on logs & extraction progress
Sometimes, errors are more obvious if you peek at the log files. They’re usually stored in the temp folder or within the setup’s temp directory. Looking there might tell you if a particular archive part failed or if it’s a permissions problem.
Wrap-up
Most of these fixes work around common pitfalls like Windows protections, corrupt files, or permissions issues. Fiddle with the protection settings, run as admin, clean junk, and tweak your system a bit—I’d say that covers about 90% of the errors where ISDone.dll or Unarc.dll crop up. It can be kind of frustrating, but once the errors stop popping up, that’s a huge relief.
Summary
- Temporarily turn off Windows Defender / real-time protection
- Run installer as administrator and do a clean boot if needed
- Manually extract files and increase virtual RAM if install files are corrupt
- Update Visual C++ redistributables & check disk space
- Check logs if errors persist
Final thoughts
Hopefully, this gets one install moving without too much fuss. These errors are annoying as hell, but they’re fixable with a little patience. Fingers crossed this helps someone else dodge the head-banging and actually get to playing.