sorry to hear that. We could not reproduce your problem. Your “MOUNTAIN LION” is your root device? You have enough space on your Computer?
A question beside this one. You want to install Version 2 of the Performer because you want to connect to VST Connect running with Cubase 7/7.5?
we’ve found the problem. The Mac Performer installer does not allow to install version 2.0.40, if you already installed version 3. To fix it, please do the following steps.
Open the Terminal.
Enter command : open /var/db/receipts/
A New Finder window will appear
Delete the following files
[a] com.steinberg.vstconnect.performer.plist com.steinberg.vstconnect.performer.bom
Now, run the Installer again. We’ll fix that with an upcoming Update.