Deleting two DB folders did not help.
After restarting everything is OK on my PC.
I've got a version of OSX Mavericks 10.9.5, and everything is running good , but Studio Player doesn't install. I didn't find the files to reset, need some help, please!
I'm afraid that ROLI Studio Player is not supported on OSX Mavericks. The earliest supported version for Mac is macOS 10.13 High Sierra.