Could I update Installshield from 10.5 to 2012? When I clicked "upgrade" button in this URL(https://shop.flexerasoftware.com/en/productselect.aspx) after entered a serial number of Installshied 10.5 we bought several years ago, It displayed a red waring string: You have entered an invalid product serial number. Please try again. Is the Installshield 10.5 too old? Do we have to buy a whole Installshield 2012?
