ok I just found the problem it misses the file "package.json" to be able to install it in .zip or move the file
Viewing post in Minimal Dark HD Aseprite Theme comments
Sorry, I still don't understand, there's no need for package.json on the theme files. If you compiled it yourself I suggest you go to https://community.aseprite.org/ and ask questions there, since I'm using the steam version myself.