Valid Acrobat Pro XI still requires activation after 30 days

I already asked a similar question in a different sub-forum, but i was recommended to make a new thread here.

The problem is this:

We need to deploy Acrobat Pro XI to computers that are 100 offline. We used the Adobe Customization Wizard XI to make a customized install for Acrobat Pro XI. We entered the serial number and used the "Grant Offline Exception" button on a computer with Internet access, which worked fine. The ISX_SERIALNUMBER property is successfully added to the mst.

Adobe Support has earlier told me that all that is needed for offline activation to work is to have the ISX_SERIALNUMBER set in the mst. Still, Acrobat complains after 30 days that it needs to be activated. Is there some other magic that the "Grant Offline Exception" button does to the installation package that i need to be aware of?

The way the installation is run is:

we run setup.exe

setup.exe (i assume?) uses setup.ini

setup.ini contains:

[Startup]

RequireOS=Windows XP

RequireMSI=3.1

RequireIE=7.0.0000.0

Require64BitVC10RT=1

CmdLine=/sl"1044" /sall /rs

[Product]

msi=AcroPro.msi

vcrtMsi=vc_red.msi

vcrtDir=VC10RT_x64

Languages=1033;1044

1033=English (United States)

1044=Norwegian (Bokmal)

CmdLine=TRANSFORMS="AcroPro.mst"

[Windows XP]

PlatformID=2

MajorVersion=5

MinorVersion=1

ServicePackMajor=3

[MSI Updater]

Path=WindowsInstaller-KB893803-v2-x86.exe

So the bottom line is that i would like to know if this way of running the installation is correct, and also exactly what the "Grant Offline Exception" button does.

Thank you