Schiit Bifrost 2

Bifrost 2 unison USB doesn’t connect with Mac OS X 10.10 or 10.11.6 El Capitan
Should work.  This is from the Schitt Site.

Mac OSX. From 10.10 on up, Macs are good to go. Sometimes you’ll run into power management problems that will require you to turn off App Nap. Got an older version of MacOS? See the comments on Windows above. Time to upgrade. The software is free.

Email them ...
Don’t believe what Schiit says about 10.10
good to go, it’s not true especially with 10.11.6 and App Napp is with OS X Mavericks. I notified Apple support they inform me you Can’t upgrade to 10.12 Sierra because age of Mac Book Pro.