Update Error (-50)
This error appears when attempting to perform an update with Premier version for MAC.
That "error" message is actually an error! It does update the software to the latest version of 1.0 (mostly song updates) and then can't conclude that it was successful! So the error is in telling you it failed, it actually only fails at telling you the update worked!
Those programmers are long gone, so we live with it, but the 2.0 is designed to work better on newer machines.
If you have a new computer you may wish to consider upgrading to 2.0 Next Gen software version
http://www.pianowizardacademy.com/shop/upgrade-piano-wizard-next-gen-2-0-software/