msiOld: productIdA, upgradeIdA
msiNew: productIdB (*), upgradeIdB
msiBlock: productIdA, upgradeIdC

The problem is that msiOld does not have any guard and that is why
I want to install some kind of (invisible) blocking-installer.

I cannot change the msiOld (because it is out in the open), but
I have all possibilities to change msiNew & msiBlock.

It is no solution though to fix it by changing msiNew, as the merge-Module
is used in two different products (msiOld1 & msiOld2) so I cannot use
msiNew (because there will be msiNew1 & msiNew2) to block the old install...

> Do "msiBlock" and "msiOld" share the same ProductCode?
> Is that ProductCode (or any ProductCode) also shared by "msiNew"?
> Do all three share the same UpgradeCode?
> Does "msiOld" have any code to guard against it being the source of a 
> downgrade?


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