i'm trying to install my purchased photoshop CS5 upgrade onto my new macbook air. i've successfully installed it previously on my other 2 macs. it is asking for the serial number of my previous version (CS3), but it only allows me to choose CS3 extended as a qualified version, which i don't have. But i did not have this problem on the other two. i do not have CS3 installed on this new mac, if that makes a difference? i would appreciate some help with this.