@mgeffro
Nice! Thanks. It's seems it works, fine now. My Bookmarks are back!

@leocg
I checked opera://sync-internals/ , but I don't see any problems. Not sure if I could identify a problem if a saw one.
Also tried login off and in again.
Not sure if I can do anything else than manually opening and saving over 10k bookmarks...

New PC, didn't make bookmarks backup (my bad) but i thought that what opera sync is for. But it doesn't work, my bookmarks don't download.

I checked my data on sync.opera.com and I found that my bookmarks are still there, but opera sync made a second folder for everything. One is almost empty(fresh install) and a second have my bookmarks.

Is there any way to force opera to sync?
Is there any way to download bookmarks directly from sync.opera.com?

screen-shot from sync.opera.com: