Problems in multi-user environment in university!

I am using Mac OSX 10.6.2. and I have installed GPO4 and Garritan Steinway Basic as an admin and they work just fine.

But when I log in as an different user (many student users) GPO4 is working BUT

1) there's no Basic piano preset in Steinway, only GPO4 sounds are available

As an admin I have used Sample manager to instal piano samples again, but when I log in back as an different user Basic piano preset in Steinway is missing.

2) Both GPO 4 and Steinway Basic keeps asking me to download the activation key and complete the registration.

I have tried to study and compare com.plogue.aria.plist files and setup-xml files but cant find any solution.
Any ideas?