I have upgraded my computer to program the MAC OS X but would like to remove this update and revert to the old one. Is this possible and how do I proceed?

I have upgraded my computer to program the MAC OS X but would like to remove this update and revert to the old one. Is this possible and how do I proceed?

Not easily, unless you backed up your data.
Did you?  If not, let that be a lesson to never install anything without a backup:
https://discussions.apple.com/docs/DOC-1992
https://discussions.apple.com/docs/DOC-1948

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