: If you encounter a "Checksum error" or "Unexpected end of archive" specifically with part 20, it usually means that specific file is corrupted. You should delete that file and redownload it from the original host.
: To extract the game, you must have all parts (e.g., part01 through part20 or more) in the same folder. If "part20.rar" is the only file you have, the extraction will fail.
: Using tools like JDownloader 2 can help manage multi-part RAR files and automatically verify if any parts are missing or broken.
: Check the The Sims 4 page on FitGirl Repacks to see the total number of parts required for your specific version.
: Always ensure you are using the official fitgirl-repacks.site domain. Many "mirror" or "clone" sites exist that may bundle malware with their downloads.
When downloading files of this nature, ensure your antivirus is active and you are using a browser with strong ad-blocking (like uBlock Origin ) to avoid malicious pop-ups on file-hosting sites.
: Most repacks include a .bat or .exe file (like Verify BIN files before installation.bat ) to check for corruption before you start the long installation process.