[Txxb161]

Is there a way to force it?  

Try this build...

http://www.jocala.com/test.exe  

Thanks, but I was able to fix it using regedit and deleting the extraneous uninstall references that were pointing to the long-ago previously deleted directory. I am now presented with a directory installation option. 

Okay, so after installing 4.2 in the directory of my choice, I attempted to do another installation of 4.2 and was not presented with a directory option, so tried test.exe and was presented with it. Test.exe should probably be moved to production.