Though listed as a "working" application on El Capitan, it's crashing on my system after deregistering and trying to re-register the device...
7/2/15 3:08:17.588 PM Kindle[11073]: WARNING: The Gestalt selector gestaltSystemVersion is returning 10.9.0 instead of 10.11.0. This is not a bug in Gestalt -- it is a documented limitation. Use NSProcessInfo's operatingSystemVersion property to get correct system version number.
Call location:
7/2/15 3:08:17.588 PM Kindle[11073]: 0 CarbonCore 0x97854973 ___Gestalt_SystemVersion_block_invoke + 135
7/2/15 3:08:17.588 PM Kindle[11073]: 1 libdispatch.dylib 0x96ad36c7 dispatch_once_f + 78
7/2/15 3:08:17.588 PM Kindle[11073]: 2 libdispatch.dylib 0x96ad3832 dispatch_once + 31
7/2/15 3:08:17.588 PM Kindle[11073]: 3 CarbonCore 0x977d0606 _Gestalt_SystemVersion + 1047
7/2/15 3:08:17.588 PM Kindle[11073]: 4 CarbonCore 0x977cf735 Gestalt + 154
7/2/15 3:08:17.588 PM Kindle[11073]: 5 QtCore 0x011c8080 _ZN9QInternal12callFunctionENS_16InternalFunctionEPPv + 1856
7/2/15 3:08:17.588 PM Kindle[11073]: 6 ??? 0x8feb1b77 0x0 + 2414549879