Update Reader 11.0.03

Hello,

we deploy Adobe Reader on approx. 60 Clients and 18 Terminalservers through GPO. This worked fine since version 10.x.

Today I was downloading AdbeRdrUpd11003.msp and try to slipstream it into our 11.0.2 AIP. It failed stating "Another version of this product is already installed..."

I was using msiexec /a <path2msi> /p <path2msp> like i did many times before.

Lastly i was able to sucesssfully slipstream the 11.0.03-msp into a newly created AIP with 11.0.0.

However, I cannot install it on any Client. The installation abort with "Another version of this product...". In the logfile i found Errorcode 1638 which does just mean the same.

Does anyone know whats the cause of this behavior resp. what i have to look for?

Thanks in advance

H.