a ".exe" is a windows executable that only runs on windows computers. If you're using linux the download you need to get is the .x86_64. I don't use linux so idk how to run that so u should probably figure that out.
ALSO there are linux softwares u can get that act sort of as a "windows emulator" that allow u to run .exes. However, for PNGTuber Plus window transparency DOESN'T WORK if you choose to do it that way.