I have just reformatted my drive and reinstalled creative cloud and lightroom. When i open it, it says there is another version running the catalog and i have to switch to it to fix the problem, but there is no other version on my computer. Does anyone know how to fix this?
Where did you put the LR catalog?
Did you install the same version of LR, which one?
OS and version?
Open the folder where the catalog (*.lrcat) is located. If you see a file with lock in it while LR is not running, delete it.
Now try to start LR again.