I found a mod written by Ryan Garlick called 'Select Product via Drop-Down'. This does exactly what I want it to do.

However, I followed the very easy instructions for this mod and it did not work. I see that the mod was written for v1.3.8, so maybe it won't work on 1.3.9, which is what I use. I am a veteran Zenner, so I am unsure why it won't work (it's so simple to install).

Is anyone able to use this mod on v1.3.9? If so, can you give me an idea of how to make this mod work?

Thank you in advance for your help.