It will be the file in the folder with the largest file size.
However, it is possible to capture the installer and interrupt the install, so that it doesn't get a chance to delete itself.
A large USB flash drive might work, but I haven't tried.By following this hint, it should be possible to get a full Lion install disk for those machines that won't require network access to install.This will give you cursive fonts to for a little insurance against the installer rebooting the system, since the app won't let the system reboot until you respond to its message asking whether you want to save the document or not.It will be something of the form diskXsY, where X and Y are numeric digits.This seems to work on my 2008 MBP machine with the App Store version of Lion installed on it, but it should be of particular interest to users of the new MacBook Airs and MacBook Pros which don't come with an install disk, but can't.Wait for the download to finish.It support all most of popular video and audio formats, like AVI, mpeg, WMV, MP4,.264/AVC, avchd, RM, MOV, XviD, 3GP, AMV, etc., transform between MP3, WMA, WAV, RA, M4A, AAC, AC3, OGG audios, and support even some unusual format like AMV.Surprisingly, it launches, even when booted into a standard Mac OS X user account from the hard drive!10.7: How to get a full Lion install disc for a new MacBook Air or Pro.As long as you don't let the installer reboot, it shouldn't be able to install anything, but I like to err on the side of caution.).New Mp3 Exports, and many more.An external hard drive or separate partition is great.
Go through the license agreement.