I managed to upgrade all the firmware in following Arturia's 'work arounds' to the letter, both in OSX 10.09.05 and Windows 7. However the option to 'Sync' within the software was remaining greyed out, therefore disallowing me to sync the software with the Beatstep Pro hardware. So after reading all the threads here and following advice I just decided to uninstall this software, as I found an older version of Midi Control Centre in Arturia's Beatstep Pro resource page. To cut a very long and dull story short, it works. Try downloading an older version of the Midi Control Centre Software if your having issues with syncing the latest MCC software with the Beatstep Pro. Hope it Helps ......