You need to dig deeper in the Creative Cloud App. I currently have CS6, CC, CC2014 and CC 2015 running just one on OSX 10.11.2
You'll find installers for the previous versions of AE under Find Additional Apps>Previous Version>View Previous Versions. Just click there and AE all the way back to CS6 will show up. If you installed using the Creative Cloud App and they still won't run you may have permissions problems. You should be able to find solutions for searching for info based on the error message.
If the F4V file does not require transparency you can usually just change the extension of an h.264 MP4 file rendered with the AME to .flv and that will usually work. If they require transparency then you'll have to go with an earlier version of AE. Don't expect very small file sizes.
I downloaded CS6, CC and CC2014 earlier on. CC2014 doesn't have the possiblility to export that format.
CC and CS6 didn't open - message saying not the right OS.
So I'm still stuck.
Going into the Previous Apps in the Cloud only show me CC 2014. Nothing before that.
If you don't need transparency try changing the extension of a test render from MP4 to f4v and send it to the client. If that works you should be just fine.
I don't think your looking in the right place. Here's where to look.
That is CS6 in the list. It's the only version that is not running now on my MacBook Pro. My desktop has them all.
Before I upgraded to OSX 10.11 I was running OSX 10.10.9 just like you. If you previous downloaded CS6 and CC then you don't have the bug fixes in those builds and they probably won't run.
Well I don't need transparency. There is no sound. Just a short 10 sec animation.
I'll try changing the extension but seems that would be too easy a fix.
Seems this isn't as easy is it should be. May be I can reinstall CS6 and find a bug fix...
Unless there is transparency an f4v is an h.264 encoded MPEG movie. I've only found two or three that would not work. You just have to make sure that the encoder does not resize the movie. MP4/h.264 is kind of picky about frame sizes. FLV doesn't seem to care.
Well I re-installed CS6 - AE and the Media encoder.
So although the AE still won't open because of the OS I'm running, the Media Encoder does !!! - and there is Flash format F4V.
So I'll try that out. There are however several options so maybe I'll be back later for more advice.
Did you try renaming aa h.264.mp4 to an f4v? 99% of the time you end up with the same file.
Well it worked. Just renaming the mp4 file to f4v. Brilliant !