Hello!When you download the file, there should be a 'RushdownRivals.exe' file. Click that to run the game.
I found it on my PC (I don’t know how it wasn’t there before) but on my Steam Deck it just says Ark can’t preview the folder. An update in the past has said it added semi Steam Deck support but I haven’t really understood what it’s instructions are
The ubuntu version hasn't been released yet which is what the steam deck can natively run. I'll try to release an ubuntu version asap.The work around is to use steam if you have it. You can use 'add non-steam game' and use proton to run windows games natively