I know this is an old topic but I noticed something. It is true you have to change the vst file to PreSonusVST3Shell.vst3
BUT!
A friend of mine changed also the vst folders name ( because of confusion and desperateness ) and it didn't work then. So change ONLY the vst file inside the PreSonus VST3 Shell.vst3 folder! And it works!
Presonus really need to step there game up! It is a few steps but why not fix it in the first place?
Good luck!