Having just installed Lightroom 6 onto my PC, I tried to launch it and it flashes up an internal error has occured: cannot create the required folder, can anyone please help?
The folder where the catalog is supposed to go does not have WRITE permission. Change the permissions on that folder.
If this is a brand new installation, the default location of the catalog file is stated here:
Preference file and other file locations | Lightroom 5
Retrieving data ...