Having this same issue. Anyone find a fix?
Do you have some other software, like Photoshop Elements 12 on your system that would generally also be compatible with ACR 8.4 final but isn’t compatible with the RC because the RC’s only for PS users?
I installed the RC the same day it was released on my computer that has PS-CS6 & PS-CC with Windows 7 and it worked ok, so the update generally works, but something isn’t on your systems.
Are you up-to-date with your PS-CC version, which seems to be 14.2.1:
And is CS6 updated to 13.0.6?
Seems I've got the same, or at least very similar problem updating to ACR 8.4(CS6). The installed Version is 13.0.6 MacOS 10.9.2 Is there still no fix?
Please let me know if you can see ACR listed here and provide with the snapshot of the same.