Update to 2015.5 fails with Exit Code 123

Hi,

when trying to update to Photoshop CC (2015.5), Illustrator CC (2015.3) and Media Encoder CC (2015.3), we get on 9 machines of the same type and configuration the following error:

Exit Code: 123


-------------------------------------- Summary --------------------------------------
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1 fatal error(s), 0 error(s), 0 warnings(s)

FATAL: Fatal Error '123' occurred while download

We are working on OSX 10.10.5 on iMac retina 5k, late 2014, 4Ghz I7. 24GB RAM and AMD R9 M290X 2048MB

Updating to OSX 10.11 (El Capitan) is not an option (and shouldn't be).

Thanks,

Yves