i solved this problem using Microsoft Media Creation Tool In-Place Upgrade.
1/ Follow this link:
https://www.tenforums.com/tutorials/16397-repair-install-windows-10-place-upgrade.html
and get part 6 "To do a repair install of Windows 10 with Media Creation Tool"
- Remember to choose "Keep personal files and apps" to keep your files and apps.
Login - change lock screen to windows spotlight - press Windows + L. It worked for me.
2/ If it still doesn't work, you should go 1 step further.
Reset and re-register Windows Spotlight
follow this link:
https://www.tenforums.com/tutorials/82156-reset-re-register-windows-spotlight-windows-10-a.html
No need to delete item in "Assets" folder, just delete the "Settings". Restart your PC.
Enjoy!
Thanks for response.
First part: I've tried to use DISM with fresh copy windows.iso for reapir - nothing found. I do not believe options like "refresh windows" or "repair windows" because there's usually warning about deletion drivers and/or apps and I do not want to risk
failed system. I'll try it during free days to have time to do installation from scratch :-)
Second part: re-registering done with no observable results . Does not work either...