Studio One 4 Prime is a free version of the full-featured Artist and Professional versions of the PreSonus DAW. One of the key features missing from this version is the ability to use third-party plugins. 

Here is the PreSonus page that explains the differences between the three versions.

If you would like to use any of our plugins or plugins from other companies, you will need to upgrade your version of Studio One to either the Artist or the Professional tiers.