When I click Register, nothing happens and I'm still on the Registration window...

This FAQ applies to AccountEdge, AccountEdge Network Edition for Canada

If you are attempting to register and activate your Canadian version of AccountEdge or AccountEdge Network Edition or the 2010 versions of AccountEdge for Windows or Mac or AccountEdge NE, you'll need to logged in with a user that has Admin rights. If you're user does not have Admin rights, the application can not save your license file.