I fail the automatic update (Mac OS 10.9+GarageBand X).
byKuroda
Category :Error when updating Piapro StudioSupport

When you use Piapro Studio with GarageBand X, there is a possibility that you can’t update Piapro Studio plug-in automatically for security constraints of the OS.

In this case, download and install the latest published updata at the support page of our WEBsite. You can update manually.

Check here for more information for the manual update method.

*Also check here about the problem that you can’t launch the updata.