by default, plugins go in the wp-content/sp-resources/forum-plugins folder… but you can change that location on forum – integration – storage locations…

after uploading the plugins, you can activate them on forum – plugins – plugin list

Do I need to unzip them first before uploading or do I just upload them as ZIP files?

Edit:

Never mind.  Figured it out.

For others who might be reading this:

You need to unzip them first.  Then make sure they are only one directory deep (to conform with the plugin requirement for 5.0).  After unzipping, upload them to the forum-plugins folder.  Go to your Admin > Forum > Plugins > Plugin List to activate them.

that would be correct.