Thanks so much to both of you for replying.
So for the Steam install, when you want to move the game to another computer entirely, you can simply copy all the folders and be on your way. For the MS Store install, you simply re-download the 1 GB launcher (since that’s a permission-locked folder) on the new PC, then copy/paste the bulk data download and you’re good to go. In both cases assuming of course you’re online with the respective storefronts up to date. Did I get that all right?