Hello and welcome to our forums,
But while running an upgraded exe, drivers are getting uninstalled.
An upgrade basically means the removal of the older product and the installation of the newer product. With that being said, it is normal for your files to be deleted and then replaced.
Is there any way to not to uninstall drivers and prerequisites while we upgrade our installer project?
In order to achieve this, please have a look on our
"How do I prevent a file or registry entry from being uninstalled or repaired?" article which I think you may find useful.
Best regards,
Catalin