Can't update betheme or activate plugins Layslider Wp, Revolution Slider and WPBakery Page Builder

Hello, 
unfortunately I have several issues with my site: https://www.friedrichs-diemetzgerei.de/

1. Adding a new Page to the Menu, crashes the Menu in the Frontend and the Content of that Page is placed over all other pages. So its Text within text, super weired.

2. I deactivated plugins one by one to see where the problem is. No I can't activate the Layslider Wp, Slider Revolution and WPBakery Page Builder plugin anymore and they ask for an update. However updating doesn't work on all three and it's said that the package/folder doesn't
contain any files. Now the page is totally crashed because of the deactivated plugins.

3. I tried to update the whole beTheme (current version is 20.9.5.2), but again it is said that the package doesn't contain any files.
contain any files. Now the page is totally crashed because of the deactivated plugins. 

Now I don't know what to do next. 

General Info: 

  • MySQL Version 5.6.42
  • PHP Version 7.1.26
  • WP Version 5.1.1

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