i have this working, but i don't use msi rules, instead i use registry as thats what i find is most consistent. in addition i use the adobe customization wizard, which i find awesome, but should not affect what you are trying to do.
for prereq:
i just use the generic is x86 or is x64 arch.
for applicable:
FileVersionPrependRegSz Key="HKEY_LOCAL_MACHINE" Subkey="SOFTWARE\Microsoft\Windows\CurrentVersion\App Paths\AcroRd32.exe" Value="Path" RegType32="true" Path="AcroRd32.dll" Comparison="LessThan" Version="11.0.6.70"
for installed:
FileVersionPrependRegSz Key="HKEY_LOCAL_MACHINE" Subkey="SOFTWARE\Microsoft\Windows\CurrentVersion\App Paths\AcroRd32.exe" Value="Path" RegType32="true" Path="AcroRd32.dll" Comparison="EqualTo" Version="11.0.6.70"
note i am checking for the version of the dll as opposed the exe. this actually mattered with 11.0.5 because only the dll was updated to 11.0.5 whereas the exe was still at 11.0.4. so i found version checking the dll to be more reliable.
