If you need to install an earlier release after you have already installed Release 2021 R2, you MUST uninstall Release 2021 R2, then re-install the releases in order. If you want to run multiple releases of Ansys software, you MUST install them chronologically. If you need to install an earlier release after you have already installed Release 2022 R2, you MUST uninstall Release 2022 R2, then re-install the releases in order. If you install an earlier release after installing Release 2022 R2, you will encounter licensing issues that may prevent you from running any products/releases. If you want to run multiple releases of Ansys, you MUST install them chronologically (for example., Release 2022 R1 followed by Release 2022 R2). Check the below notice in the ANSYS 2022R2 Installation Guide The most important tip is that Ansys requires an uninstall and re-install if you installed older versions on top of newer. The first step to success is to make sure to install Ansys Versions Chronologically! Sometimes you just need to uninstall old versions and reinstall the new.
Instructions for a Complete Uninstall of Ansys Products and Shutting Down the License Manager
