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What you have to do is find out what Steam names the FFXV folder (I imagine it would be "FINAL FANTASY XV WINDOWS EDITION" or just "FINAL FANTASY XV" if we consider how the demo folder is named) and copy the installation there. By default, Steam installs games to "C:\Program Files (x86)\Steam\steamapps\common," so you'd have to put the folder with the files in there.
If it works, you should see a message saying "discoverying local files" or something similar when Steam starts to allocate disk space. No need to verify files if that message shows up because if Steam thinks anything's wrong, it will download files all over again (and it could be a few files worth a few MB to a few GB to the whole game, as I have learned the hard way).
Good luck finding out the name of the folder if it isn't the ones I suggested, though... People on Steam can be very petty if you download the game through torrent even if you own it a hundred times over.
Well i could just finish zodiac age while waiting for the 85 GB to finish downloading
And for the record, you can actually backup your games on an external hard drive to avoid having to download them again. Just copy the folder (after the game is fully downloaded and up to date, and I would also recommend avoiding mods in the backup if you want a clean installation the next time) to your external HD and then copy them over back to the common folder when you want them back on Steam. It's a good way to save space with big games you might want to play again at some point.