You can use MiniProg3 to program the EnCoRe II device, but you still need the 5-pin to USB interface adapter to do so. I don't think there is an alternative for this.
Schematic for 5-pin to USB interface adapter can be found here.
Hmm, I see. Do you have any suggestions on where I should purchase the components to make it? This is really my first foray into this type of stuff, so i'm very inexperienced. Thank you for your response!