I recently bought Lion, and am upgrading my machines. I have an iMac which isn't connected to the internet that I want to upgrade. (It is located in a camp where internet isn't available...) I read all about how to do it after I purchased Lion on my macbook pro, by using the same install file. However, there seem to be two competing ideas out there. After downloading Lion, I saved the "Install Mac OS X Lion" app that is placed in the Applications folder. I also unpacked it and saved the InstallESD.dmg file seperately. I've burned both to DVD. Which one should I use, and what are the differences or implications of using either? From what I've read: Install Mac OS X Lion - This is the exact file downloaded from the App Store, and may or may not include personal information in the attached files. InstallESD.dmg - This is the file packaged within the above. It is the actual installer, and is identical to what anyone who has installed Lion uses. It can be burned to a DVD to create a bootable copy, and (maybe?) for a fresh install on a blank drive. From my research - and various threads here - it seems as though either of them can/should be copied to my iMac's Applications folder and run from there. But which is best, and why? Or can I update directly from the bootable InstallESD DVD? Thanks!