@frOM, @Machist, @thomasinbkk, @wrowolf
Right, this has all been very helpful and we now know what the issue is. There will be a new build of RW7 out with a fix soon.
In the mean time, once you have copied your RapidWeaver 6 addons, please open the Finder, click Go in the menu then Go To Folder… and paste the following:
~/Library/Containers/com.realmacsoftware.rapidweaver/Data/Library/Application Support/
If you see a folder there called “RapidWeaver”, open it. If not, create a folder named “RapidWeaver”. note: this is NOT the same as the “RapidWeaver 7” folder
Paste your RW6 addons into the “RapidWeaver” folder and restart RW7. You will now have all of your addons from RW6 in RW7.
Thank you again for your help and patience.
—E