Do you have Final Cut X installed??? You can't load the codec update without Final Cut or Motion installed or at least downloaded according to Google.
I just ran some tests and get a compressor failure with CC 2014 but CC works just fine. I'll do some more investigating and file a bug.
I do have FCP X installed, that's where I copied the codecs from so that they could work inside AE.
Thanks for testing - seems like you have confirmed what I thought, CC works fine while CC14 doesn't.
I'm wandering if this is intentional or just unsupported at the moment, and may be incorporated into a future CC update..
Either way I will also file a bug report, even though I'm not sure this actually counts as a bug, but hopefully it will be taken into account by the Adobe team.
If anyone else did manage to have success with getting ProRes XQ to work inside AE CC14, or has any info about support for this codec being incorporated into future CC updates, I would love to hear about it.
So no one has any info on this?
If you're also interested in XQ support - please submit a feature request form to Adobe. Myself and my coworkers already have, but hopefully more requests will bump up this issue on Adobe's future plans.