That seems to have loaded & opened LR Ok but the FOLDERS tab in the left column is empty.
When I tried ADDing a folder by clicking on the + next to the FOLDERS tab I was able to navigate to my PhotoFolder and IMPORT a number of photos but all the adjustments were missing.
Is there a way to retrieve the previous status and in particular all those adjustments (many many adjustments).
I also have thousands of photos so just importing them may take a week.
You have obviously opened the wrong catalog.
Go to File->Open Recent and select each catalog shown there until you find the one you want.
DO NOT IMPORT.
Yes as mentioned by dj-paige, you seem to have landed in a wrong catalog.
You need to browse through Finder/ File Explorer and manually go to the location of you main catalog and load it from there.
There were 2 catalogs listed in the File->Open Recent and neither of them helped.
The first catalog was completely empty and the 2nd had a single photo which I'd previously imported as a test.
I found the right catalog and all's well
Thank you so much for the help
glad to know the issue is resolved.