A couple of request regarding upgrades and older versions:
a central repository with all final versions available (I may need the 2.1.2 Full Installer, or even a 2.0 or 1.2: who knows?) 
chance to upgrade older versions always incrementally: if I have a customers with 2.1 valid licenses and he’s using 2.1.1, I may want to upgrade his solution to 2.1.2, not to current release
chance to choose if upgrade to latest build or current stable build: this to prevent a customer accidentaly upgrades to a beta or RC release. Not frequent, but possible…