I've enabled handoff on Macs (mine is 2011 era) that don't officially support it, but with El Capitan changes, Apple has really tried to put the handcuffs on more tightly so users can't muck with any system files
Specifically, El Capitan enabled System Integrity Protection, which is causing a lot of grief by it's defense in depth addition to restricting many system filesystem locations. Also, you may have noticed that the 0xED app no longer works in El Capitan - you for some reason can't search and edit anymore. Grrrrr....
Is it possible to get handoff (continuity) working for a 2011 Mac that's running El Capitan?