Runtime engines for all recent LV versions can be found at: http://digital.ni.com/softlib.nsf/webcategories/85256410006C055586256BBB002C130D?opendocument&node=132070_US
Or FTP at: ftp://ftp.ni.com/support/labview/runtime/windows/.
I'm not sure you would want the Runtime engine to install automatically when installing the program though...what if you want to reinstall the program?
I have a built application that I update regularly. I always include the Runtime Engine in the installation. If it's already there the installer just checks to make sure it's a good installation. Re-installing isn't a problem.