I don't know if this is always a case but there's usually and option to skip giving money or something that says "Just take me to downloads"
Its on his Patreon. Not threw Itch. I will say he puts a lot of time and detail into his maps and, in my opinion, is one of, if not the best, map maker in FS. Almost all the buildings on this map are modeled after the real buildings. It takes a lot of time and effort to make his maps that a lot of modders dont put into their maps.
I really liked the vibe of Taheton and didn't experience any errors.
But i do am a bit disappointed at the moment. I was a subscriber to his patreon for 3 months. But no updates were published to the map. Nor was i able to download it.
So i stopped my subscription and just pray it may gets released one day...