First, it's only available on PIC18F devices. Go to "View/Compile and Program Options". A pop-up will appear. Check the top check box which reads, "Use Compiler Long Words (18 Series MCU Only)"

Your MicroCode Studio version and your PBP version are different. My MicroStudio is Version 5.0.0.5 while my PBP is Version 3.1.0.4. Not sure if you're confusing them.