I'm also getting a CRC error! (Using WINE here)
I found this post on reddit:
I did what Tyler said, THUGPro updates successfully, but when I go to launch again the same CRC error occurs.
I also tried using the pinned installer from the thpsx discord.
I did have THUGPro working in the past.
I'll totally paypal you some $ if you can get it working for me.