i upgraded in 2018 after having 2008. at that time there was no registration or activation - they just trusted you! and there were no realtracks but i do remember getting realdrums 1-3

not sure if the OP needs to install 2007 to qualify for the upgrade as opposed to the first time purchase

and some of us still love Powertracks even though we have RB. i think its a little less resource demanding and quicker as it doesn't have the BIAB auto accompaniment load