Alex Ruben
How To Fix the Isdone.dll Error When Using Fitgirl Repack Successfully in 2025
If you’re trying to install a FitGirl repack and keep running into the ISDone.dll error, you’re probably ready to rip your hair out. This error pops up often during large game installations, and honestly, it can be a pain because it just stops the process or causes crashes, no matter what you try. Sometimes, it feels like Windows is making simple things way harder than they should be. The goal here is to fix this glitch once and for all, so you don’t get stuck on the same error every time. Basically, following these steps will give your system a bit of a boost in handling those big game files and hopefully let the install run smoothly, no more crashes or corrupt files.
How to Fix the ISDone.dll Error When Installing FitGirl Games
Method 1: Manually replace the DLL files in system folders
This helps if the error is due to corrupted or missing DLL files. The idea is to get fresh copies that Windows can use without hassle. It’s kind of weird, but on some setups, just copying these DLLs into system folders solves the issue, even if they’re technically already there. On some machines this fails the first time, then strangely works after a reboot or a second try. So, don’t lose hope if it doesn’t work immediately.
- Download the ISDone.dll and Unarc.dll. Be sure to pick the latest versions, because Windows likes to be picky about DLL compatibility.
- In your Downloads folder or wherever they end up, right-click each file and choose Extract All. I usually send them to my Desktop for easy access because searching for DLLs in the download folders later is a pain.
- Open This PC, then go to C:\Windows\System32. Copy both DLLs here. If Windows asks for permission, click Continue. If you’re running a 64-bit OS, don’t forget to also go to C:\Windows\SysWOW64 and paste the same files there. Because of course, Windows has to make it harder than necessary.
- If you want to be extra safe, right-click the DLL files in your Desktop, select Copy, then go to the same folders and choose Paste. You might be prompted to overwrite existing files—click yes if you’re confident these are newer or clean versions.
Method 2: Install the Visual C++ Redistributable Packages
This one’s a classic. Basically, missing or outdated C++ libraries can cause a ton of errors during game installs. Installing the latest version tends to smooth out the process. Trust me, it’s worth trying.
- Grab the Visual C++ Redistributable All-in-One. I’ve used this pack more times than I count to fix DLL errors like this.
- After downloading, right-click the ZIP and choose Extract All. Quick tip: extract directly to your Desktop so it’s easy to find.
- In the extracted folder, double-click
Install All.bat. Windows might throw a security warning—if it does, just select Yes or Run. The script will run some installations — just bear with it. - Follow the prompts; it’s usually just clicking Yes or Allow. Once done, reboot your PC because Windows likes to be stubborn about DLL updates and library installations.
Method 3: Tweak virtual memory (paging file) settings
This is kinda mandatory for those big game files, especially if you’ve got less RAM or your system is on the older side. Increasing virtual memory basically gives Windows more ‘spread out’ room to handle install files, which reduces the chance of ISDone.dll errors showing up.
- Type Control Panel in your search bar and open it.
- Click on System and Security, then System.
- On the left, select Advanced system settings. You might need admin rights for this.
- In the System Properties window, click on 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 C: drive. For the custom size, use these as a rough guide based on your RAM:
- 4 GB RAM: Initial size 2048 MB / Max size 4096 MB
- 8 GB RAM: Initial size 4096 MB / Max size 8192 MB
- 16 GB RAM: Initial size 8192 MB / Max size 16384 MB
- 32 GB RAM: Initial size 16384 MB / Max size 32768 MB
- 64 GB RAM: Initial size 32768 MB / Max size 65536 MB
- Click Set and then OK. Restart the PC afterward — probably not a bad idea to do this after all the changes.
Method 4: Restart your PC
This sounds trivial, but sometimes Windows needs a good reboot after all those DLL and system setting tweaks. The idea is to let all the new files and settings settle in. It sounds lazy, but it often helps fix the error if nothing else clicked yet.
Just save your work and do a proper restart. Usually, that’s enough to get your installer back on track. On some setups, the error persists after a reboot, so move on to the next method if that’s the case.
Extra tips & common pitfalls
- Make sure Windows is fully up-to-date. Sometimes, an outdated system can cause DLL hiccups.
- Disabling antivirus temporarily can help, especially if it’s blocking or quarantining DLL files. Just don’t forget to turn it back on after!
- Check if your system meets the game’s minimum requirements—especially storage and RAM. For big backups and game files, these matter more than you think.
Wrap-up
Once you’ve done these steps, the ISDone.dll error should, at least in most cases, be a thing of the past. Not every fix works instantly, and sometimes a reboot or trying a different method will do the trick. If run into anymore issues, revisit the DLL replacements, or try updating your system drivers and Windows itself. Basically, this is about setting your system up to handle those hefty files without breaking a sweat. Hope these hints help make installing your games a little less frustrating.
Summary
- Download fresh DLL files and copy them into the system folders.
- Install the latest Visual C++ Redistributable packages.
- Increase virtual memory based on your system’s RAM.
- Restart and give your system a little time to settle in.
Frequently Asked Questions
What exactly is the ISDone.dll error?
Basically, it’s Windows throwing a fit because it can’t allocate enough memory or handle large files during game installation. Usually, it means some DLL files are missing, outdated, or your system runs out of virtual memory.
Can I prevent this error from happening again?
Keeping your Windows updated, managing virtual memory properly, and making sure your PC meets the game’s requirements are the best bets. Installing proper system libraries like Visual C++ Redistributable also helps a lot.
Is it safe to download DLL files from other sites?
Only stick to reliable sources like DLLME, or better yet, use your system’s built-in mechanisms. Downloading DLLs from sketchy sites can be a big risk because of malware or incompatible versions.
Hopefully this shaves off a few hours for someone trying to get their game installed without running into that annoying error again. Fingers crossed, this helps!