...or maybe it didn't actually downgrade. Hard to tell.
Help-->About says it's 11.0.08. Programs and Features says it's 11.0.08. SCCM report says it's 11.0.08.
Properties of AcroRd32.exe say it's 11.0.10.32.
So the actual executable is the right version, but parts of the product itself are confused at to what version it is. Maybe some of the other 192 files are the wrong version, but Adobe only knows.