How to update Mac OS X 10.6.8 to 10.7 I have Cienega on my Mac and did a recent update.  Since the update I'm not able to open in Applications Cienega.  I'm receiving a error message that says  I have Mac OS X 10.6.8. The application requires Mac OS X 10.7 or later.  How do I upgrade?
Apple has started selling OS X Lion redemption codes,  for £14 (in the UK) so you can still buy the old OS if you need to.

See also: Is It Possible to Still Upgrade to OS X 10.8 Mountain Lion.