Problems with updating and customizing the theme

Hello! We purchased a theme for the site https://kuzovport.ru, there is a license
We have 2 problems:
1. We can not update the theme, the system gives an error (see screenshot) "archive can not be installed"
What could be the problem? The site is working fine. But the hosting is ZipArchive not installed Can the problem be related to this?
2. How to set up a smoother scrolling when you click the top menu items? We would like the scrolling (scrolling to the desired part of the page) was like in this demo: https://themes.muffingroup.com/be/cakes/?utm_source=demos



Thanks in advance for your reply. Sincerely, Eugene

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