I've been trying to sort out the correct command line to silently install the msp file adobe published for adobe reader 10.1.2, AdbeRdrUpd1012.msp.  First, I'll state my deployment method is to use SCCM.  I've been using it for some years to deploy, remove and patch software and I am pretty familliar with it.  So the previous patch file installed by using this command line "msiexec /i "\\path to 10.1.0 MSI" PATCH="\\path to 10.1.1 MSP"  This worked perfectly.  So now I come to 10.1.2 and this method doesn't work.  I get complants from my test computers stating "Another version of this product is already installed.  Installation of this version cannot continue."  I also tried using the /p switch as "msiexec /p "\\path to 10.1.0 MSI" PATCH="\\path to 10.1.1 MSP".  When i use this method I receive a message stating "The patch package could not be opened.  Contact the application vendor..."

Clearly I am missing something as installing these updates cannot be this difficult.  I see a lot of folks using GPO.  I've never used this method and am not at all familliar with it.  It just seems to me there should be a better way to get these to install more consistantly. 

Let's see, additional details:  Target clients are all windows XP SP3.  My user account has administrator rights.  All client PC's were built using the same base image.  I've tested various methods of install from the command line and each ocassion gets me the same results.  Currently all clients are running reader 10.1.1.33.

Any thoughts, tips, suggestions are most appreciated.

If you'd like additional detail, if I missed a critical piece of information, please just let me know and I'll gladly supply that.

Thank you ladies and gents.