Hello, I'm running into walls trying to make a bootable/installation usb drive for os x 10.7.4, or Lion. I have a Macbook pro retina 15" mid 2012, which from what I have researched originally came with lion. There is plenty of tutorials on how to make this bootable usb, but I am stuck on the downloading lion part of the process. Mac no longer lets you download or buy lion, except for the start up CD's, which I purchased thinking it was a download. I will get lion in the mail in a few days. So, Im trying to figure out, can I then make a bootable drive from the lion installation disks I paid $20.00 for. Since, this mac book pro has no disk drive. My other mac, the screen broke and it isn't working properly, came with lion, but it is a 2011 mac book pro and I think it was just updated to lion. My main computer is a older iMac desk top, and has a disk drive. I purchased the new mac book pro second hand, and it has been nothing but problems for me. Anyways, I've giving up on the downloading lion and then putting it on a thumb drive, since I can't find lion to download. Any advice? I'm just learning how to really work on my computers and appreciate any help I can get. Thanks. I'm in art school and would love to get this lab top up and running to make my life much easier!!