How am i going to downgrade my operating system? i am using os x mavericks right now and i want to downgrade to os x mountain lion

i`m afraid i might lose any file or application from os x mountain lion that is why i wanted to go back to 10.8.5 and stop using 10.9.2.
i dont want to lose any file or move them to any places, what should i do now??

In order to downgrade you must erase the drive, then install the version of OS X that came with your computer. If that is not Mountain Lion, then you will have to re-download Mountain Lion in order to install it. To do that will require repurchasing the code to download Mountain Lion because it is no longer available from Apple.
It would be much easier to resolve what problems you think you have with Mavericks.

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