How to make VB.Net setup file to remove previous version?

If you want to install an application over a previously installed  version of the application, you  must increment the setup version and then set RemovePreviousVersion flag to True.

Remember if the new setup file has both the same version and setup build, the installer will prompt you to repair or remove if you want.

If setup file has the same version but different build, you have to uninstall the old version and then run setup to install the new one.