Alex Ruben
How To Resolve CRC Check Failures in Fitgirl and Dodi Repack Games (2025)
If you’re trying to install a FitGirl or DODI repack and keep hitting that dreaded “Failed CRC Check” error, yeah, it’s frustrating. Sometimes all the files seem fine, but Windows or the installer just throws a fit and complains. This guide aims to walk through some common fixes—things that actually worked on machines that kept crashing or throwing checksum errors at different stages. It involves making sure the necessary DLL files are in order, updating system components, and tweaking some settings. Not everything’s guaranteed, and sometimes it’s a bit of trial and error, but hey, at least these steps should get you closer to a clean install.
How to Fix Failed CRC Check Error in Windows 11 or Windows 10
Method 1: Make sure your CRC files are correct and properly placed
This is the most common cause—corrupted or mismatched DLL files. The CRC errors pop up when the installer or game files don’t match the checksum, which is often fixable by replacing or updating certain DLLs. Here’s what to do:
- First off, download the latest isdone.dll and unarc.dll. It’s kind of weird that trusted DLLs come from DLLME, but it’s worked on other setups. Make sure you grab the newest versions—crashes tend to happen if these are outdated or corrupt.
- Once downloaded, go to your Downloads folder.
- Right-click each DLL file, select Extract All, and pick a destination like your Desktop—no need to bother with complicated directories.
Method 2: Copy DLLs into the system folders
This part is usually where Windows throws a fit—because of course, Windows has to make it harder than necessary. Placing the DLL files in specific system folders ensures they’re globally available during installation. Why it works? Probably because some installers look for these files in system directories and give up if they don’t find ’em.
- Navigate to Local Disk (C:) > Windows > System32.
- Copy
isdone.dllandunarc.dllinto this folder. When Windows prompts for permission, click Continue. - Now, remember—on 64-bit systems, the installer might also need these DLLs in SysWOW64. So, go there too and paste the DLLs again.
Pro tip: Sometimes, it doesn’t work on the first try. It might be worth rebooting or running the installer as administrator to give it enough permissions.
Method 3: Install and update Visual C++ Redistributables
This step is kind of infamous, but many installations crash or checksum errors happen because of missing runtime libraries. Installing the correct Visual C++ Redistributable can fix a lot of compatibility issues.
- Download the Visual C++ Redistributable Runtime Package All-in-One. Yeah, it’s long but worth it.
- Run the installer or extract it if needed. Usually, just double-click the setup—if you see options to repair or uninstall, go ahead and choose repair.
- If there’s an
install_all.batfile or similar in the extracted folder, right-click and run it as administrator.
On some machines, this step is hit or miss — on one setup it worked after 2 minutes, on another, it took a reboot and a few tries. Doing this ensures your system has all the runtime libraries needed for game installers and their dependencies.
Method 4: Adjust virtual memory (paging file) if errors persist
This one’s kind of a wild card. If your virtual memory settings are weird or too low, the installer might get corrupted files or checksum errors during heavy file operations. Here’s how to tweak that:
- Open Control Panel → System and Security → System.
- Click on Advanced system settings on the left panel.
- In the new window, under the Advanced tab, click on Settings in the Performance section.
- Go to the Advanced tab again and press Change in the Virtual Memory section.
- Uncheck Automatically manage paging file size for all drives.
- Select your C: drive, choose Custom size, and set the values based on your RAM:
- For 4 GB RAM: Initial size: 2048 MB, Max size: 4096 MB.
- For 8 GB RAM: Initial size: 4096 MB, Max size: 8192 MB.
- For 16 GB RAM: Initial size: 8192 MB, Max size: 16384 MB.
- For 32 GB RAM: Initial size: 16384 MB, Max size: 32768 MB.
- For 64 GB RAM: Initial size: 32768 MB, Max size: 65536 MB.
- Click Set, then OK. Restart your PC to apply.
Method 5: Restart & Retry
After all this fiddling, give your PC a good restart—sometimes Windows needs it to register new DLLs and settings properly. Then try rerunning the installation. Keep an eye out for any prompts or errors during setup.
Extra Tips & Common Issues
- Disable your antivirus temporarily—you never know, sometimes Windows Defender or third-party AV can interfere with file operations or delete files during extraction.
- If errors keep popping up, verify the integrity of your game files or redownload the repack—some torrent or download sources might supply corrupted files.
- Check forums dedicated to the specific repack or game for any patch or fix suggestions—others might have the same issue.
Wrap-up
While no fix is perfect, these steps tend to clear the “Failed CRC Check” error quite often. Fixing DLL placements, updating system components, and Windows tweaks can make life a lot easier during those annoying installations. It’s kind of a mess, but with patience, most problems are fixable—sometimes after a few tries or reboots.
Summary
- Download latest DLLs from reliable sources
- Place DLLs into system folders and SysWOW64 if needed
- Install or repair Visual C++ Redistributables
- Adjust virtual memory settings to match your RAM
- Restart and try again, maybe with administrator rights
Could this get messy? Yeah, probably, but worth a shot
Hopefully, this shaves off a few hours and gets that game installed cleanly. Sometimes, fixing CRC errors is just about making Windows and the installer play nice together. Good luck!