On Mac at least, you just have to download the zipped disk image and copy over the contents. I just put it in ~/Applications, and it worked.
But you have to keep everything in the top directory and copy that around not the .app
It is not packaged as a Mac Application that is all in a .app file which you can copy to /Applications. Most of the other files should be in ~/Application Support or ~/Documents to meet normal macOS directories.