I’ve tried rescanning multiple times, but no luck, it still won’t load. I have contacted their support email to see if they are willing to sort it out mentioning that the GP team are very responsive to helping plugin devs sort out compatibility issues.
I did some Googling and did find that apparently Reaper has issues loading this plugin too.
Just to update the thread. The support person was responsive and the developers have now released v1.2 which now intiliazes correctly and works within GP4.