Logic Pro X stuck on "updating information about Audio Unit plug ins..."

I am running Big Sur 11.1 on a MacBook Pro 2017.

I bought and installed Logic 10.6.1 a few days ago, I have not been able to open it at all. As the title says, it crashes on the start up screen with the "updating information about Audio Unit plug ins...". Behind this is another error message "Registry error". Spinning beachball and a force quit every time.

I have tried the following:

• Reinstalling Logic
• Restarting the Mac
• Starting without core audio (get to the open new project page and then it crashes instantly once new project is clicked)
• I have looked at some online guides showing how to move or delete third party plug-ins... I have not used Logic prior to this, I have no third party plug ins, the folder is empty.

Please help, thanks in advance.