The trial mode limits you to just playing the piano. Once you upgrade by buying a license key and entering it when you open the app, you can play all 128 instruments. Download Piano Keys now.
It runs on pretty much all versions of Windows and Mac.
Please contact us, we are happy to help.
On Mac: Simply search for and delete the "Piano Keys.app" file from your computer, and Piano Keys is now uninstalled.
On Windows: Select "Uninstall Piano Keys" from your Add/Remove Programs Menu, and Piano Keys is now uninstalled.