Sketch Up 2021 Repeated Crashing and unable to open files from location

Hi SKUP community… I’m having similar issues with the consistent crashing…… I was on 2020 Sk/Up uploaded new 2021 with new iMAC and have since upgraded to Big Sur. Yesterday I followed some of the advice here, deleted 2021 version, re-installed it onto my Applications, then made sure and deleted new download from the Downloads folder.

I’ve also noticed, its seems to crash when I’m in other applications, then when I go back to work in Sk/Up, whilst it’s sitting open, this prompts a crash…

I’m also unable to open SkUp Files directly from their folders. So when I double click on a the Sk/Up file it doesn’t open it from this location. I have to open Sk/Up then open them from there… Any top tips for me? ………