Alex Ruben
How To Fix ISDone.dll, Unarc.dll, and Setup Errors During FitGirl Repack 2025 Installation
Installed a FitGirl game recently? Yeah, those setup errors with ISDone.dll or Unarc.dll can get pretty annoying. Sometimes, Windows just decides to throw a fit during extraction or installation, especially if your system’s a bit old or if antivirus is overzealous. This guide aims to help smooth out those bumps, so you can actually enjoy your new game without tearing your hair out. Basically, these fixes help Windows chill when it’s preventing unpacking or copying files, which is often the root cause of the errors.
How to Fix ISDone.dll and Unarc.dll Errors When Installing FitGirl Games
Disable Windows Defender Real-Time Protection During Setup
This is the classic move. Windows Defender’s real-time protection sometimes sees the unpacked files or hefty install scripts as threats and blocks them, which leads to those pesky error messages. Turning it off temporarily can make a huge difference, especially if you’re hitting errors like “damaged files” or “corrupt archive”.
- Open the Start Menu and type Windows Security.
- Click on Windows Security to open it.
- Go to Virus & Threat Protection.
- Click on Manage Settings under the Virus & Threat Protection Settings section.
- Switch off Real-time Protection. You might see a prompt asking for permission, just approve it.
On some setups, this step makes the magic happen, but don’t forget to turn it back on once you’re done. Because of course, Windows has to make it harder than necessary.
Start the Installation with Administrative Rights
Sometimes, the installer needs a bit more juice — like admin privileges — to write files properly and avoid those errors. Right-click the setup file and choose Run as administrator. It’s not foolproof, but a lot of times it helps prevent issues where Windows blocks certain actions or files.
- Locate the setup file (probably in your Downloads or where you saved it).
- Right-click and select Run as administrator.
This helps the installer bypass certain Windows protections, especially on locked-down systems. Works surprisingly often, and if it doesn’t, at least you’ll know you tried.
Check Disk Space and RAM Usage
If your PC’s running low on RAM or disk space, it can cause tricky extraction errors. Basically, if Windows cannot allocate enough memory or space for the unpacking process, you get those DLL errors or setup crashes. Double-check you’ve got enough free space in the drive you’re installing to. Also, close other apps, especially memory hogs. On some machines, not doing so results in failed extractions or corrupted files during install.
- Open File Explorer and check free disk space.
- Open Task Manager (press Ctrl + Shift + Esc) and check RAM and CPU usage.
- Close anything unnecessary; even background browsers or torrent apps can make a difference.
Run the Installer in Compatibility Mode (if needed)
Old setups might stumble on newer Windows versions. If the installer is a bit old or gets whiny, right-click the setup .exe file, pick Properties, go to the Compatibility tab, and check Run this program in compatibility mode for. Choose Windows 8 or Windows 7. Sometimes, Windows doesn’t like being forced to run an installer that was made for older OS versions, especially with Windows 11 or early Windows 10 updates.
- Right-click setup file → Properties.
- Navigate to the Compatibility tab.
- Check Run this program in compatibility mode for and select the previous Windows version.
- Hit Apply and try installing again.
This is kinda a shot in the dark, but some folks find it helps prevent those DLL errors mid-setup.
Set Up Folder Exclusions in Windows Security
If you’ve been battling these errors repeatedly, it might be because Windows Security or your AV software keeps blocking or scanning the install folder during extraction. Adding your install folder to exclusions can help Windows stop second-guessing those files and let the installer do its thing.
- Open Windows Security.
- Go to Virus & Threat Protection.
- Scroll down and click Add or Remove Exclusions.
- Select Add an exclusion and pick Folder.
- Navigate to your game install folder (e.g.,
C:\Games\GameName) and select it.
Once added, it’s generally best to re-enable real-time protection afterward, but sometimes Windows needs this extra nudge to stop interfering during those big unpacking steps.
Run the Installer in Safe Mode (if you continue to struggle)
Alright, this is kind of a last-ditch effort, but if all else fails, boot into Safe Mode with Networking. The idea? To strip down Windows to just the essentials and let the installer run free without Windows Defender, background apps, or driver conflicts messing with the process.
- Press Windows + R, type
msconfig, hit Enter. - Go to the Boot tab, check Safe Boot and select Network.
- Click OK and restart.
- Run your installer again.
- When done, revert by opening
msconfigagain and unchecking Safe Boot.
Totally not ideal, but it can get past Windows’ more aggressive protections that block file extraction or writing.
Summary
- Turn off Windows Defender real-time protection during install.
- Run setup as administrator.
- Ensure enough free disk space and RAM availability.
- Try running the installer in compatibility mode if on an older setup.
- Add your install folder to Windows Security exclusions.
- As a last resort, try Safe Mode with Networking.
Wrap-up
Those DLL errors are a pain, but most of the time one of these tricks clears the way for a smooth install. Sometimes, it’s just about catching Windows in a moment where it’s a little too difficult. Hopefully, this shaves off a few hours for someone. Because, honestly, nothing’s more frustrating than spending ages troubleshooting only to find out the real fix was a simple toggle or folder exclusion.