How to downgrade to Yosemite from Sierra?

Hey, I'm looking to downgrade my Macbook from Sierra back down to Yosemite purely as it seems to be running slower and some softwares i used to use haven't been updates for sierra.

Any help on how to do this would be appreciated as you can no longer download the Yosemite installer from the mac app store so this is likely only possible by creating a bootable USB. However obviously i cannot find the installation file to boot onto it.

If anyone can lend advice or help i would be very thankful.

submitted by /u/Crucible7
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