I do have Sketch-up installed ready, but to be honest, I haven't a clue on how to drive it. It's something I know I will eventually need to buy, but I need a lot more practice building before I can think about moving into the black arts of 3D design and unfolding. Personally, I don't think my skills are up to complex designing yet, but I couldn't resist investigating the FREE offer of Pep Designer. Give an old version as a freebie, badger them to install all the updates, then once you've got them using it, keep wafting the latest (vastly improved) version under their nose at a discount price. I'm getting the feeling that they are maybe trying Corel style marketing. pdo files I open now open in Pep Designer instead of Pep Reader, but there is a ready option to go to the reader. I haven't yet bought a password, nor have I found time to play with the program to see what the trial one can do. That was when I noticed all the greyed out items, so I investigated the 'Buy Password' tag.

Mainly to make sure it had installed properly.

As I said Mike, I've downloaded it, installed it, and opened it just for a quick look.

Pepakura viewer program