Confusing 'Show HN' post - title should perhaps say 'Archived - use VS Code' ?
From the OP download page "Visual Studio for Mac builds on top of MonoDevelop" [1], and the Install link points to Visual Studio for Mac, but this is now discontinued, in favor of Visual Studio Code [2]. The github repo is archived Oct-2021 [3].
[1] https://www.monodevelop.com/download/#fndtn-download-mac [2] https://learn.microsoft.com/en-us/visualstudio/mac/what-happ... [3] https://github.com/mono/monodevelop