Quote Originally Posted by Tacoguy123 View Post
EBOOT files usually go in the /GAME folder of your PSP's memory stick. If you tried to put the file in the /ISO folder it won't work.

Edit: I also forgot to mention that EBOOTS that were directly downloaded from PSN usually only work with the PSP that received the license keys. These are not transferable between accounts, and will only work with the original account. The only way around this is to have your PSP authorized to download your friend's games, or to find a cracked version of the game online that will work when moved to the /GAME folder.
By authorized, do you mean basically that my PSP is activated with their PSN? Because if so, then that completely defeats what I just asked.