Are you trying to install any cummuliative update on SharePoint and receiving error "The expected version of the product was not found on the system". This is because you are missing some patches which are required before you install the update. You can open Central Admin and navigate to "Check product and patch installation status" page and check for missing patches. Alternatively, if you don't want to do the check and just want to install it, open command prompt and run the below command. Cheers !
packagename.exe PACKAGE.BYPASS.DETECTION.CHECK=1
