UR22C for Raspberry Pi

I’m considering buying a used UR22C soundcard for Raspberry pi to build a Pianoteq 8 VST for my piano. My first question is does UR22C support well any of the RPi OSes?

I also use an iPad but I have found all the piano sounds I purchased (and then
asked to be refunded - including pianoteq 8 for iPad - sounding pretty lame and not worth the investment. I read that UR22C supports VSTs but is it possible to run “external” VSTs like the PC version of pianoteq 8?

A third Q: there are lots of posts on forums regarding disturbing clicks and pops with UR22C. Have these problems been solved and how to update an older UC22C