1) I am used to with the Microsoft Window
2) I am not familiar with the Macintosh OS
3) I have a MacBook Pro, and I want to upgrade it to Mac OSX Lion
4) I can download it (say it from http://www.apple.com/macosx/
5) My question: When downloading "this files", It is OK if I use the Microsoft XP or I have to use the Mac OS?