Hi @izaychik63 ,
thank you for the clarification.
Making backup is always a wise decision it is a pity you have deleted it in this case.
Also worth trying the new version before upgrading / installing the new one (keeping the old one parallel on you system for a while) and exporting your Preferences if you have any. (You can find info for this in this post:
Upgrade to 4.4.0 did not migrate extensions - #4 by Daniel_Weikert)
Back to the present situation: do you experience any abnormality except that the knime-workspace folder contains less files and folders than it had using 4.5.2 version?
Regards