Testers of my application need to install multiple instances of the same app on thier PCs.

When the SETUP.EXE is run for the second time, it very cleverly detects the fact that the app has already been installed and gives the user an uninstall option, but no install.

Has anyone any ideas how I can acheive multiple instances.

It is possible to just copy the files, but they are nagging me to be able to run setup again.