Despite the claim that Vuescan is universal it does not work on many scanners. My very common Brother scanner was not supported and the Vuescan guy said it was "hit or miss".
After much travail my scanner (Cano Lide 400 - $89) works with Catalina. The agent checked my mac, tweaked a few things and said to erase anything relating to Canon, clear the Trash and restart. I then downloaded the software but again nothing. He ...