Installing Photoshop through CC on an iMac (Mavericks) fails at 90 percent - ASU has quit unexpectedly.

Question

Trying to install Photoshop CC 2014 through Creative Cloud on an iMac running Yosemite. I have the CC Photography plan, although I first attempted the install during the demo period and the end result was identical to now.
The install stops at 90%.
It seems that the main installer actually succeeds (Photoshop is left in a usable state) but maybe fails to register itself properly with CC.
If I restart CC, Photoshop shows as installed, but with an upgrade available.  If I try to upgrade then it stalls at 50%.
The failure in /Library/Logs/Adobe/Installers/Adobe Photoshop CC 2014 15.0 01-07-2015.log.gz is "ASU has quit unexpectedly."
~/Library/Logs/PDapp.log says:
01/07/15 22:47:45:465 | [INFO] |  | ASU | vulcanEventDispatcher | vulcanEventDispatcher |  |  | 145752 | Build Version - 8.0.0.156
01/07/15 22:47:45:465 | [INFO] |  | ASU | vulcanEventDispatcher | vulcanEventDispatcher |  |  | 145752 | Logging Level verbosity Set  to 4
01/07/15 22:47:45:465 | [INFO] |  | ASU | vulcanEventDispatcher | vulcanEventDispatcher |  |  | 145752 | Taking appId as default in broadcastVulcanEventForLicenseRefresh
01/07/15 22:47:45:466 | [INFO] |  | ASU | Vulcan5EventHandler | Vulcan5EventHandler |  |  | 145752 | Build Version - 8.0.0.156
01/07/15 22:47:45:466 | [INFO] |  | ASU | Vulcan5EventHandler | Vulcan5EventHandler |  |  | 145752 | Logging Level verbosity Set  to 4
01/07/15 22:47:45:466 | [ERROR] |  | ASU | Vulcan5EventHandler | Vulcan5EventHandler |  |  | 145752 | Inside sendVulcan5MessageForLicenseRefresh.
If I uninstall and re-install it stops at 90% again.
Rebooting doesn't help, either in normal mode or into safe mode with no other apps running.
I've logged out of CC and back in again.
So far the problem is consistent and reproducible every time.
Lightroom installed with no errors.

Answer 1

I'd already forwarded the logs to Varun.
It seems your mail system is also not fit for purpose.  If an email containing a zip file generated by one of your own tools is silently dropped then how is that usable by support?
As I explained to Varun on the phone, I use this computer for work and I'm connected to a corporate VPN so for company confidentiality reasons I'm not willing to give him access.  However I'm happy to be guided through any steps sensible required outside of office hours...
So to that end I spent over an hour on the phone with Varun to no avail.
I do not feel that anyone I have spoken to has any real expertise.  No one has looked at the log files that I have supplied.  Varun hadn't read up on the case history or forum post.  He started off asking me to download Creative Cloud as if I hadn't already done that already.  His main suggestion was to install the software as root, which is dumb for a couple of reasons as a) OS X does not allow the root user to have a graphical session for security reasons, root privileges are accessed via sudo.  b) the installer uses sudo anyway to install as root:admin rendering his suggestion meaningless.
For the record, and so that other people know what DOESN'T help, the other suggestions that Varun asked me to try are:
1) changing the permissions of /Library/Application Data/Adobe/ and ~/Library/Application Data/Adobe/ and all the folders bellow so that everyone has read and write access (doing so for the latter directory also makes no sense since all the files and directories below it are owned by my and the only users involved are my user and root and both already had full access).  Needless to say the upgrade stalled at 50% as before and the same failures were reported in the logs.
2) launching the update from within Photoshop itself (from the 'Help' menu, click [Update..]).  The install won't proceed as it says that 'Adobe Application Manager' is running.  I can see that the Adobe Application Manager is launched when Photoshop is started, but at Varun's insistence I still rebooted my machine and tried again.  Surprise, surprise, Adobe Application Manager was launched when Photoshop started and the upgrade refused to proceed in the same way.
3) downloading the Photoshop installer outside of CC and installing that.  The install succeeds, but CC still says that an update is pending.  Clicking update results in the same hang at 50%.
That was the sum total of the suggestions I received.  I need someone who understands the logs (ideally someone who at least has source code access) to have a read through as I feel all the key information is there.  I don't think that having a 1st line support person hacking around on my machine without reference to the information I've already supplied is of any benefit to anyone.  I don't like having my time wasted.
Varun agreed to escalate the issue last night, but I've not heard anything since, and tomorrow is that day that I have to cancel my subscription if this is not resolved.
Given that I've not had any use out of these products over the last month (why invest time in a product that you're likely to throw out of the window?), the idea of paying a month's for the last month's subscription would be rather galling.  I don't like the general concept of software as a service anyway, but especially as I have received no service even with an active subscription, this appears to be the nail in the coffin for me.
I've asked several times now, but can you please give me the details of how I can make a complaint.
Thanks,
Gavin.