Cannot open catalog after updating to LR Classic v.10.2

[defaultyurzrubk1ixk]

LR says it cannot open the catalog.

I tried opening the last 4 backups. Same problem.

Catalog is too big to attach it for any help.

I am questioning the backup process if I cannot recoup my work.

[JohanElzenga]

What exactly does Lightroom say?

[defaultyurzrubk1ixk]

It actually said "Cannot open catalog" without any explanations.

I unzipped the last 4 backups and each time after trying to open one after the other, same message.

But just now LR restarted automatically and I think it rebuilt the catalog (message went very fast on the screen so I can't be more precise) and it finally opened the catalog. 

Let's hope everything goes well in the near future.

Thanks for trying to help!