Hi @forumlover ,

wpForo – Groups Plugin Integration addon is designed to integrate Groups plugin content restriction rules with wpForo forum plugin. You can grant different type of accesses to different forums based on users’ GROUPs.  You should install the Groups plugin before purchasing this addon. This integration powers your forum with access control to wpForo categories, forums and sub-forums. It lets you create a members-only forum, so you can offer discussion threads of a certain forum exclusively to group members. It’s very easy to set up, you just need to edit forums and set corresponding forum access to each Group you’ve created by Groups  plugin.

So you need to install the Group plugin before activating the integration addon.