Is there a difference in functions between these two versions?
The pluginboutique writes "Important note: This is an update from Guitar Rig 6 Pro, the full version of Guitar Rig 7 Pro is also available."
pluginboutique.com ("Guitar-Rig-7-Pro-Update-From-Guitar-Rig-6-Pro")
I own Guitar Rig 6 Pro (v6.4.0).