Fresh Install on Big Sur 11.6 BST not working

Hi all, just bought and installed BetterSnapTool for. Problem I'm having is it is not working at all like i have seen on other macs. I have given it all permissions including the screen recording and everything else it has requested, and all i want to the basic (no customizations) corner and side snaps but none of them are working, any tips? im running Mac air 2015,Big Sur 11.6. Thank you