How many times has "I can't save to MP3" been asked over the years in the forums ?
That's why so many other audio apps give a download link and you put the Lame.dll in a folder that the app uses, like Audacity:

How do I download and install the LAME MP3 encoder?
Because of software patents, Audacity cannot include MP3 encoding software or distribute such software from its own websites. Instead, use the following instructions to download and install the free and recommended LAME third-party encoder to export MP3 files with Audacity. See the LAME Legal Issues page for more details.

1.Go to the external LAME download page......

Same with ASIO support in Audacity it can't be distributed with it but you can compile it yourself.