I want rid of Yosemite but can't do it! (Bluetooth issue)

I should have heeded the warning signs! I've been running Yosemite since the end of October and, despite the fact that my well-used Macbook Pro is already five years old, it's made life frustratingly slow. But I took that as a sign that I needed to streamline my ageing Mac down, free up some space, get rid of unused apps etc (which never made any difference to how well the computer runs, btw). I recently got bought a wireless Bose speaker and am rather annoyed to find that Bluetooth doesn't work anymore. I'm pretty sure that happened when I installed Yosemite.
And the Bluetooth totally does not work. It's crossed out at the top of the screen, 'Bluetooth not available', doesn't show up in System Preferences; it's totally gone. Many hours last night were spent trying to fix this problem. I've reset the SMC, PRAM; just about every solution offered on the Apple forums for this problem, I've tried. Nothing works. So I thought it would be a good idea to just get rid of Yosemite once and for all.
I didn't have a backup of my previous version of Mavericks, but I found it on My Purchases page on the App Store. Only spent about 5 hours waiting for that to download, and then the dialog box casually informs me that 'This copy of the 'Install OS X' application is too old to be opened on this version of OS X'. GROAN!
What the heck can I do to get rid of Yosemite? I despise it, but am willing to upgrade to the next version if this problem will get fixed. How can I get my Bluetooth back without having to take it into a Mac store and probably pay the flat rate just to get this little niggle fixed? Any suggestions greatly appreciated. Thanks!

In order to go 'backwards', you need to erase your hard drive - Macs have never supported going to an older OS version while the newer version is installed. So, once you have a bootable installer, boot from that, erase your drive and then install.
As you will lose all your files, make sure you have a good backup first.

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I want rid of Yosemite but can't do it! (Bluetooth issue)

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