1 person found this helpful
Please take a look at this article Error: 'Unexpected error opening catalog' occurs in Lightroom after Windows 10 upgrade. and let us know if that helps.
I am using an iMac, running Sierra. These instructions are for a PC, and I cannot figure out how to do the same thing on my computer.
I don't use a Mac, and am not familiar with Time Machine, but generally speaking, Adobe applications cannot be migrated or transferred to another computer, you have to do a proper install.
I suggest that you uninstall LR4, then run the cleaner tool - Use the Creative Cloud Cleaner Tool to solve installation problems
Then install the program normally - if you don't have the DVD you can download the latest LR4 (4.4.1) from here: