Lightroom Classic (Desktop) had been working correctly. Last night Windows/Microsoft updated my Windows 10 with an upgrade. This turned my computer on its head. I lost my emails, which I had to re-install, still not working. The biggest thing, lost access to LR Classic and 10,000 photographs. I eventually found them, but now LR will not start, showing 'Assertion failed'. All of my edits, presets etc do not exist anymore. I have read many articles on different forums, indicating locate the 'picture' folder, which I have located under my user name. I have saved my previous .Lrcat file in dropbox, so I have this. I have uninstalled and re-installed LR, but still doesn't work. I am okay at computer skills, but no where near and expert. I am not very happy with the windows update. I P1ssed off person. Hope somebody can help.