I was in my local hobby shop today looking at the upgrade software for G7.0. On the box it stated that it could upgrade G4.0. Can I upgrade my G3.5 with that software? I like my 3.5 and I've never bothered to upgrade it even though I'd like more planes, etc. If I can upgrade my G3.5 I think that'd be a better idea than just outright buying 7.5, especially since I've got the interlink controller. Why buy another one? Thanks.