I've tried down loading planes off of G3 & G3.5 and I get the error message,and I guess this is due to not being able to down load the add on disk. Iguess once RealFlight gets an update going for G4 so the add ons can be down loaded then hopefully the problem will besolved. I was told by Hobby Services that they are working on somethig to make the add on workable with G4 and they hope to have the problem solved real soon.
NEDYOB