hi, I have a mid 2010 MBP with 8GB Ram, 1 TB Sata drive, and 32mb geforce nvidia card. i am going to be doing a clean install, so i am trying to make a bootable usb for mavericks (After reviewing Yosemite, i think i will go with Mavericks due to the bad reviews of Yosemite). I was unable to find Mavericks in Appstore, so i googled and found various direct download link in articles, but when i click, appstore is saying, "This is not valid in US region". does apple not let you download old OS x once new yosemite is out? thanks.