WINDOWS USERS ONLY
To add the Slate Digital default VST2 plugin path in Studio One 3, please go to the "Studio One" drop down menu and select "Options".
Select the "Locations" tab and select "VST Plugins". Click "Add" to navigate to the following plugin path(s)→
If you are running Studio One in 64bit: C:\Program Files\Vstplugins
If you are running Studio One in 32bit: C:\Program Files (x86)\Vstplugins
Additional Troubleshooting (How To Reset Blacklist)
MAC & WINDOWS
Go to the "Studio One" drop down menu and select "Options". Under the "Locations" tab click "Reset Blacklist".
If issues persist, please contact support here.