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I recently bought used MacBook Pro that has ssd 256gb installed with OS X Sierra. I need to downgrade to El Capitan but my time machine backup that has El Capitan on it is almost a 1 TB so Time Machine says it can't restore because theres not enough room on the new drive.

I also tried downloading El Capitan from App Store which I did, but when I try to install it says

This copy of the “Install OS X” application is too old to be opened on this version of OS X.

Need help!