How can I activate any plugin - VC, Ultimate Addons, etc ?

If you want to have a personal license you can buy it and use it. I have extended licenses which allow to include plugins into the pack, but I provide all updates with the theme.

All plugins work without activation. it needs just for auto-updates

How to update theme and plugins read

https://velikorodnov.ticksy.com/article/4335/

https://help.market.envato.com/hc/en-us/articles/213762463-Bundled-Plugins