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Catalog not linking after update this week

Nov 6, 2015
Lightroom Experience
Lightroom Version
Classic CC v7.4
Operating System
  1. Windows 10
I updated to the latest version of LR CC yesterday (v7.4) a new catalog was automatically introduced -5.Ircat. Now my images are no longer visible ie there is an image box in the library grid view but no image and I have 115000 missing images.I have checked the relevant setting in Edit>Preferences>Default Catalog and this is set to the relevant drive and latest Catalog 5. When I try to open Catalog 4, I am told 'can't use, not writable and cannot be opened'
regards Nigel Hazell