Can I get back my MacOsx 10.6?

Hi everybody,
first of all, pardon me, my english not very good and am new Mac user. I have one simple or maybe some stupid question regarding about Mac OSX.

My friend gifted to me MacbookPro early this year (version 2009) with Mac OSX 10.6 (he already upgrade his MacOS from 10.5 to 10.6).

Yesterday I faced some problem regarding my program software . I have very urgent design to submit on that day, I reformat and downgrade this MacPro (because that the only CD install that he gave --->MacOs10.5).

So how can I upgrade and get back MacOs 10.6. Did I need to purchase back 10.6? Because I want to upgrade Lion 10.7.

Thanks
Ms.Pening @__@

Ms.Pening said:

Hi everybody,
first of all, pardon me, my english not very good and am new Mac user. I have one simple or maybe some stupid question regarding about Mac OSX.

My friend gifted to me MacbookPro early this year (version 2009) with Mac OSX 10.6 (he already upgrade his MacOS from 10.5 to 10.6).

Yesterday I faced some problem regarding my program software . I have very urgent design to submit on that day, I reformat and downgrade this MacPro (because that the only CD install that he gave --->MacOs10.5).

So how can I upgrade and get back MacOs 10.6. Did I need to purchase back 10.6? Because I want to upgrade Lion 10.7.Thanks
Ms.Pening @__@

Click to expand...

Yes you do unless you buy a Lion USB from Apple.

As Germany_Chris says, you have two options:

1. Buy a Snow Leopard retail disk ($30US or local equivalent) and install it, then upgrade to 10.6.8 using Software Update, then buy Lion from the Mac App Store. It costs $30US and installs "in place."

2. Buy a Lion USB drive from Apple ($70). This is more expensive but saves time and provides a bootable backup of the system in case you need to re-install.

Thank you guys.
i think i'm prefer Lion USB