Well. Problems with itch client are often out of my league. So unfortunately I don't have a slightest idea what the problem might be except for:
-Itch client doesn't support 32bits systems (which would be strange)
-You don't have necessary frameworks or libraries
-It just doesn't like you
Putting the last one (which is obviously a joke) aside, your best call is to try reaching itch.io support to help you with the client. As PixelPauer said, you can try reaching them on the board. If it's not successful, you can send a screenshot here and we'll try to understand what exactly is the problem.