Comments - Can't install MariaDB 10.5.8 on Windows 2012R2
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I'd guess you're missing the C runtime, or UCRT libraries. They are preinstalled on Windows 10 and corresponding server versions , but not on 8.1/2012R2 , although I believe that was a "recommended" update for downlevel Windows.
They can't be found in form of Microsoft KB updates, e.g here https://support.microsoft.com/en-us/topic/update-for-universal-c-runtime-in-windows-c0514201-7fe6-95a3-b0a5-287930f3560c