I am upgrading Acrobat Standard clean installation as a test from 10.0.0 to 10.1.9
We should probably have a side discussion on this as well... How are you upgrading from 10.0.0 to 10.1.9 ???
Have you considered that the MSP designed to upgrade a 10.1.9 (which is likely assumed to be a patched instance of 10.1 > 10.1.1 > 10.1.2 > 10.1.3 > 10.1.4 > 10.1.5 > 10.1.6 > 10.1.7 > 10.1.8 > 10.1.9), might not be compatible with your Direct-To-10.1.9 methodology?
If you install an instance of 10.1.0 and patch it to 10.1.9, does the 10.1.10 package then work?
Does the Adobe-supplied 10.1.9 package properly detect on a 10.1.8 system?
Does the Adobe-supplied 10.1.8 package (which has correct prerequisite rules) properly detect on a 10.1.7 system?