Something sounds funky. I've never heard or seen anything saying Boolean is extra. I have RDS 5.5 and never got a boolean serial number request. It's part of RDS, not an extra plugin. You should be able to use the boolean without any message of wanting a number. I don't have RDS or the disks with me, but I would look for a number on the CD. If you can't find one, then try reinstall. Weird!