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I just installed the missing FFMpeg but Audacity is stubborn and thinks the dll is not available although I also find it when searching in the libraries. Definitely a bug that should be fixed if that’s the case.
Request for Info.
3.0.0.0 is NOT an official Audacity release. See also: https://forum.audacityteam.org/t/is-audacity-de-an-official-domain-from-the-audacity-team/50373/1
The current version of Audacity is 3.1.3 and is available here: https://www.audacityteam.org/download/
Older versions such as 3.0.0 are available here: https://www.fosshub.com/Audacity-old.html
If you are running a 64-bit version of Audacity, you need to download the 64-bit version of FFMPEG. Audacity > Help > About Adacity > Build Information > Build type will say 64 bits. Otherwise it is a 32-bit build, and you need the 32-bit version.