We were installing the SharePoint 2010 CU that was recommended by vendor to resolve some of the issues that we were facing with one of the custom developed application.
We installed it on 8 to 9 farms without any issues till we got to a Farm that was throwing below error while executing the CU
“The expected version of the product was not found on the system”
After some research I found the way to overcome this error:-
Solution is when executing it append the parameter :- PACKAGE.BYPASS.DETECTION.CHECK=1 (run this from command line)