The full version (with windows GUI) requires Visual Studio C++ Redistributable 2019 x64.
https://support.microsoft.com/en-us/help/2977003/the-latest-supported-visual-c-downloads
Direct link: https://aka.ms/vs/16/release/vc_redist.x64.exe
Too many changes to summarize. Almost a complete revamp.
v0.2.1 fixes a bug in the gui when displaying retro moves