The people that are new to the site and posted here, SHOULD do some more reading to learn the rules and the "stickies" in all the threads because they DO list links for the files.
This thread is many years old, you can tell by looking at the VERY first post. I would also like to point out that General Eggs and zach0504 necro-posted which is a pretty big no-no on the site. It's one of the rules.
And zach0504, to answer your question, you CAN turn on the edge ID. Some files don't have it shown because when you zoom in on the pieces on the right side in pepakura, it causes lag from loading all the numbers. In pepakura, at the top, click on "2D Menu". Look for where it says "Show Edge ID". Just click on that and the menu will disappear after you click on it, but if you click on 2D Menu again, you will see that there is anow a check mark to the left meaning that the function is now activated.
It is a little misleading, since the Intro Manual brings you to page 1 for Pepakura tutorial and file sourse and lists all of the files but only if you aren't paying attention. we are on page 26 of this thread.....so yeah is only a few years old. something is bound to be dead at this point.