Hello! Tell me please how to get updates on your plugins and theme?

Download it from.
https://osclasspoint.com

do I register again? or enter data from the registration that you specified when buying a topic and plugins?

how to update the theme and plug-ins? how? is there a way?

I use my email which I was used in old mbshop,register new account in osclasspoint, and all my previous purchase were linked automatically into osclasspoint.
As far as i understood, u ll get a problem, if u did purchase in osclass market.... probably u need to purchase one more time...from osclasspoint.(

No, of course, I was smarter than the first and bought from the official site 

The problem is how to install updates on the theme and plug-ins?

Mostly it is rrequired just replace files.

and my work on the theme and the plugin will disappear?

yes, theefore you need to keep administration of your changes

The question is settled, thanks to everyone for their help.