Installscript project

I need to reproduce the "Completely uninstall old setup before installing new setup" installscript MSI/basic MSI feature in installscript project? Basically I want user to run the setup once and if its installed it runs the uninstall and automatically launch setup for new version.

I was able to detect if it's MAINTENANCE mode and uninstall but don't know how to automatically launch setup for new version.

Really appreciate any help.
Thanks