Hi there,
I got a solution for my problem.
I went to the folder:
C:\Users\"YOUR-USER-NAME"\AppData\Roaming\PreSonus
There is the folder "Studio One 4"
In this folder is "x64"
In my case I took the content of "x64" and moved it in a Folder on the "desktop" (for example). So the "x64" ist empty.
Than I started SO4 again and suddenly Autotune Pro was there.
My VST-paths and soundset-paths in "options" was gone, but it was worth it.
Maybe you can copy step by step the content of your "Desktop"-Files back to "x64" to see wich file ist doing what.
In may case I only got small correction to do. So I didn´t do the copy stuff.
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Attention:
If it doesn´t work with this. You can also move all Folders/Files from the "Studio One 4"-Folder to the desktop. So "Studio One 4" is empty.
SO4 starts totally new and fill the folder again. All ist delete. The paths, your midi, audio-Settings. SO4 comes totally clean.
I call it the hardcore-reset.
Like before...you can copy step by step all folders back. In my case I discover the content of "x64" as the main problem.
Hopefully it helps.
And remember:
If something get´s destroyed, I am not to blame
Greetings from germany :-)