Conflict of the plugins

“Under construction” plugin (the basic version) has started to conflict (after the last update, I think) with two of my other plugins “Post Grid by PickPlugins” and “Media Library Organizer”.
When the “Under construction” plugin is activated Posts, Custom Links, Categories in ‘Edit Menus’ in admin section are blocked/not working, can’t open them.
It works fine on my other very similar website (Divi based), only because I don’t use the plugins described above.
Do I need to upgrade to the Pro version in order to fix the problem?

Many thanks.