DaVinci Resolve constant crashing

Hi there,
I just installed DaVinci resolve 17 (for Mac OSX) and began working on a fusion project..
The problem is that the application is crashing - it's done it a bit earlier in the project (across range of actions) but now it does it every single time I try to add keyframes to animate the sequence... so I can't move forwards.
The error message I get is:
"DaVinci Resolve can\U2019t be opened.
\U201CDaVinci Resolve\U201D is damaged and can’t be opened. Delete \U201CDaVinci Resolve\U201D and download it again from the App Store."
I have indeed deleted it and re-downloaded the whole application (in case it was a bad install) but no.. still happens. It's unusable.
Does anyone know what it could be?
Many thanks
[Running Mac OS Catalina v10.15.7 on an iMac Retina 5k 17" 2020 at 3.8ghz 8 core i7 / 32GB RAM / AMD Radeon Pro5700 8GB]
I just installed DaVinci resolve 17 (for Mac OSX) and began working on a fusion project..
The problem is that the application is crashing - it's done it a bit earlier in the project (across range of actions) but now it does it every single time I try to add keyframes to animate the sequence... so I can't move forwards.
The error message I get is:
"DaVinci Resolve can\U2019t be opened.
\U201CDaVinci Resolve\U201D is damaged and can’t be opened. Delete \U201CDaVinci Resolve\U201D and download it again from the App Store."
I have indeed deleted it and re-downloaded the whole application (in case it was a bad install) but no.. still happens. It's unusable.
Does anyone know what it could be?
Many thanks
[Running Mac OS Catalina v10.15.7 on an iMac Retina 5k 17" 2020 at 3.8ghz 8 core i7 / 32GB RAM / AMD Radeon Pro5700 8GB]