So I wrote all the below, but then tried install on a totally different (Windows 8) system, and had the same exact 
problem. Which leads me to believe the QNX server is down or misconfigured at the moment. Could someone confirm?

And if so, is there any way to install the SDK from local files?

Evaluation license days left becoming annoyingly low due to this :-/

~~

"No repository found" when trying to install SDK in Momentics

I download and install Momentics (from the 6.6 DVD), when it starts up prompts me to install some SVN and Java stuff, 
that works no problem, also says I need to install SDK. Specifically this is in Momentics 5.0.1 Build v201402230336 
running under Windows 7 64-Bit, all latest updates applied.

I go to Help -> Install New Software... and under "Work with:" select "QNX Momentics Update Site - https://www.qnx.com/
account/updates/foundry27/ide/5.0/"

Then get this in the big white box with the "Name" and "Version" columns:
Could not find https://www.qnx.com/account/updates/foundry27,

Also I've seen elsewhere, sorry but forget exactly when:

No repository found at https://www.qnx.com/account/updates/foundry27/ide/5.0/' 

~~

Some other facts about this install:
(a) It was actually working when I first installed it.
(b) I might have messed it up when I also installed Momentics for BlackBerry 10
(c) I've reinstalled it, no help.
(d) But the "http://community.polarion.com/projects/subversive/download/eclipse/3.0/juno-sr2-site/" repo works fine, 
which leads me to believe the problem is QNX-specific.