Alex Ruben
How To Fix Isdone.dll Error During Fitgirl and Dodi Repack Game Installations (2025)
If you’ve ever tried installing one of those big Pokémon-sized game repacks like FitGirl or DODI and hit a wall with the ISDone.dll error, yeah, you’re not the only one. It’s super frustrating—especially when everything else seems to be in order. Usually, it’s caused by corrupted or missing DLL files, system memory issues, or incompatibility. This guide is meant to walk through various common fixes, some straightforward, some a bit more involved, that can get this error outta your way and let you actually play your new game.
How to Fix ISDone.dll Error When Installing Games
Method 1: Copy Missing DLL Files into System Folders
This actually helped on a few machines, but it’s kinda weird and not always elegant. Basically, when ISDone.dll or Unarc.dll is corrupt or missing, Windows throws a fit during game installs. By manually replacing or adding the DLL files into your system directories, you might be telling Windows, “Hey, I got this!” It’s worth a shot if you’re seeing errors during unpacking or installing.
- Download the latest versions of ISDone.dll and Unarc.dll. Make sure they’re recent — sometimes, older versions can cause issues.
- Extract the DLL files from the ZIPs you downloaded. If they’re just DLLs, no extraction needed, but if they’re in archives, right-click and pick Extract All.
- Drag both files onto your Desktop to keep track, then right-click each one and select Copy.
- Navigate to This PC > Local Disk (C:) > Windows > System32
- Paste the DLL files here (press Ctrl + V). You might get a prompt asking for admin permissions — just click Continue or provide permission.
At some point, Windows might ask if you’re sure, but on most machines this step works fine. Expect a slight chance of needing to reboot after—just to make sure Windows picks up the new DLLs.
Method 2: Install the Latest Visual C++ Redistributable
Because of course, Windows has to make it harder than necessary, right? Missing or outdated Visual C++ runtime libraries are a common cause of DLL issues with game installs. Installing the latest all-in-one package usually solves the problem.
- Head over to this link and grab the Visual C++ Redistributable All-in-One package. It’s a pretty safe bet.
- Run the downloaded file — it’s usually a ZIP or EXE. If ZIP, extract it first, then run the
install_all.batfile as administrator (right-click > Run as administrator). - This should install all necessary redistributables — just follow prompts. Reboot afterward just to be safe.
This fixes a lot of DLL matching issues, especially if your system is missing some runtime files necessary for unpacking or installation routines.
Method 3: Adjust Virtual Memory Settings
This garbageman’s step, but honestly, low virtual memory or RAM issues can cause installers to crash, especially if they’re trying to extract huge files or unpack large data blocks. Increasing virtual memory sometimes acts like a buffer against these crashes.
- Open Control Panel (search in Start).
- Go to System and Security > System.
- But here’s the trick—click on Advanced system settings in the left sidebar. It opens the System Properties window.
- Under the Advanced tab, hit Settings under Performance.
- Select the Advanced tab, then click Change under Virtual Memory.
- Uncheck Automatically manage paging file size for all drives.
- Select your C: drive, then set the sizes according to your RAM:
- For 4 GB RAM: Initial 2048 MB, Max 4096 MB
- For 8 GB RAM: Initial 4096 MB, Max 8192 MB
- For 16 GB RAM: Initial 8192 MB, Max 16384 MB
- For 32 GB RAM: Initial 16384 MB, Max 32768 MB
- For 64 GB RAM: Initial 32768 MB, Max 65536 MB
- Hit Set, then OK. Restart your PC and see if that helps.
This tweak helps your system handle bigger files during install. Sometimes, it makes a difference, especially on machines with limited RAM or when Windows gets picky during heavy unpacking routines.
Method 4: Double-Check Your Files and Setup
If none of the above works, maybe something got corrupted during download or extraction. Re-downloading the game files and DLLs often does the trick. Also, ensure you run your installer with administrator rights—not doing so can block DLLs from copying into the system directories.
Pro tip: use a download manager if you’re on flaky internet, to avoid corrupted files. And try redownloading the DLL files from the links provided earlier — sometimes, a bad download causes more trouble than it’s worth.
Method 5: Run the Installer in Compatibility Mode
This is a bit of a long shot, but if your OS is newer, some old setup routines don’t play nicely. Right-click your game setup or installer, choose Properties, go to Compatibility, and check Run this program in compatibility mode for. Then pick Windows 10 or 8, depending on what the installer was meant for. Hit Apply and try again.
Extra Tips & Common Issues
Sometimes, even after all this, errors persist. Double-check that the DLLs are in the right folders, especially if you’re installing on a virtual machine or a system with multiple drives. Re-download if you’re suspicious of corrupt files, and ensure your Windows installation is up to date—Microsoft often patches these bugs in updates. Also, check your RAM sticks via Windows Memory Diagnostic or tools like MemTest86, because failing RAM can throw all sorts of random errors that seem DLL-related.
Wrap-up
This whole process can be a bit tedious, but usually, one of these steps will clear up the ISDone.dll errors. Just keep an eye on whether the error message points to a specific DLL or part of the process — that can help you narrow down which fix to try first. No promises it’ll be a one-click fix, but it’s worked enough times to get people back into their games.
Summary
- Download necessary DLLs and replace them in system folders.
- Install or update Visual C++ Redistributable packages.
- Increase virtual memory if your system memory is tight.
- Re-download files to prevent corruption.
- Run installers with admin rights or in compatibility mode.