I upgraded our 2 Primary Servers successfully to SP4. But Post 11SP4 Update Prereq and 11.4.2 fails.

Post 11SP4 Update Prereq installed with an "Error". I applied TID 7017441 successfully - so I think I have Post 11SP4 Update Prereq installed.

But 11.4.2 refused to install. "One or more pre-requisite updates failed to install..."

"Clear error and retry" for Post 11SP4 Update Prereq -> Error again

Canceled Deployment of Post 11SP4 Update Prereq and deployed again -> never leaves status "assigned"

That's were I am now: what ever I try, I only get to "assigned".

loader.log shows

[TRACE] [07/24/2016 10:51:07.632] [4363] [ZENLoader] [173] [] [Loader.CreateIOAUpdateXmlQueueHandler] [] [System update is still in Progress. So should add QueueAction and exit] [] [] [] [ZENServer]

Is that "System update is still in Progress" related to my problem?

There is no activity in the system-update.log.

Any ideas?

Thanks,
Mirko