The is a common frustration for PlayOnLinux (POL) users. It occurs when the security hash (MD5) of a downloaded file doesn't match what the install script expected.
For system-level issues on Ubuntu/Mint, you can also try running sudo apt-get clean to clear package caches.
: Use your web browser to download that file. error in pol_download_resource md5 sum mismatch (3 attempt)
: If the host server is temporarily down, the "download" might just be an error page, which will definitely fail the MD5 check.
If the script keeps failing, you can often bypass it by manually placing the file where POL expects it. The is a common frustration for PlayOnLinux (POL) users
If a specific component like winhttp or dotnet is failing, Winetricks is often more up-to-date than the built-in POL scripts. Open in PlayOnLinux. Go to the Miscellaneous tab.
: In some cases, routers with parental controls or proxies can modify the file data during transit, leading to a mismatch. Reporting the Issue Forums PlayOnLinux Error installing component (winhttp) : Use your web browser to download that file
: PlayOnLinux scripts are community-maintained. If a site like Microsoft or Archive.org changes a download link, the MD5 hash stored in the script becomes invalid.