You don't need the blaster, just download and install "Logitec Harmony remote software 7.x on an old PC or laptop and create an account. Hook up the remote via a USB cable and the software will detect the remote and from there you can program it and save the profile on the remote. When done and disconnected from the PC it will try to find a blaster, just skip through the process using Yes its working etc. Then go into the "Options" on the Harmony and find the RF settings and double check that nothing is set to a blaster. It should now work as a pointed IR remote.
You can pick up Hubs for a few bucks on ebay if you want the RF feature and mini blasters.