How can I revert back to the old version of os

I updates adobe flash and then safari, itunes and finally the operating system now it its stuck on the grey screen will not boot back, how can I revert back to the old system i do not have the discs

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You can't

You can try a safe (shift boot) to disable extensions if that works you can manually remove flash, iTunes & Safari (but you'll be without any browser unless you have another one on the machine) that cause the hang but without an OS install you can't drop backwards.

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