HT201250: Use Time Machine to back up or restore your Mac
Learn about Use Time Machine to back up or restore your MacQ: So I recently updated to OS X mavericks 10.9.1...however I really just need 10.7.5 so that I can use AVID media composer as it is ... So I recently updated to OS X mavericks 10.9.1...however I really just need 10.7.5 so that I can use AVID media composer as it is not compatible with the highest OS X. Can I downgrade to 10.7.5 somehow? more
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Jan 1, 2014 7:33 PM in response to sarahwrightsby Barney-15E,The simplest way would be to restore from the backup you made prior to upgrading.
If you don't have one, create one. A clone would likely be the easiest.
Once you have all of your data backed up and know you can access it, you'll have to erase your hard drive and then reinstall whatever OS you had previously.
If it was Snow Leopard (10.6), then reinstall from the DVD.
If it was Lion or Mountain Lion, then boot up holding down cmd-opt-r. That will boot into Internet Recovery and it will install the original shipping OS: http://support.apple.com/kb/ht4718
See this user Tip: https://discussions.apple.com/docs/DOC-6161