I want to upgrade to Premiere Element 11 but as a student I currently use 10 on both my laptop and my iMac. If I upgrade by downloading to 11 will the upgrade be valid on both machines or just the one I use to download the upgrade? The only real reason I want to upgrade is the new support for sharing to Vimeo.
Also, my camera records in AVCHD - does 11 still support that?
Buy the box with the DVD in it. The license is for two computers and the disk has both the Mac and PC version. If you download, you only get one version. So, you would have to have two Macs or two PCs.
A "big deal" in version 11 is the official support of AVCHD, including the 2.0 version that has 1080p60 as part of it.