Case # 02595460 Upgraded from InstallShield 2015 to InstallShield 2021. The installer created by InstallShield 2021 does not detect that there was a previous version installed (installer created by InstallShield 2015) and instead goes straight to install instead of upgrade. The Upgrade Code and Package Codes are the same between 2015 and 2021, the Product Code has changed (as is necessary), and the Product Version has changed from 4.1.12.9 to 4.2.1.7. ... View more