NO 3rd party VST plugins work with the Artist version of Studio One. You need to upgrade to Producer or Pro for that capability.
Third Party VST integration is not supported with Studio One Artist. In order to be able to utilize additional plugins, you would need to either upgrade to Studio One 3 Professional or upgrade your Artist version by purchasing the VST/ReWire Add-On; which allows for the use of additional non-bundled Third Party VSTs as well as adding ReWire Support in Artist
--> IMPORTANT INFORMATION: Here is a Studio One 3 Version chart breakdown of what features are included in each version of Studio One 3. It is VERY important that you read this article so you understand the limitations of EACH version of Studio One 3:
http://studioone.presonus.com/compare-versions
You can purchase the Upgrade or Add-On here:
Upgrade:
https://shop.presonus.com/products/software/studio-one-prods/studio-one-upgradescrossgrade/Studio-One-3-Artist-to-Studio-One-3-Professional-Upgrade
Add On:
https://shop.presonus.com/products/software/studio-one-prods/studio-one-add-ons/VST-and-AU-and-Rewire-Support