Is it correct that Pepakura requires OS X 10.13 or better? I'm still on Sierra. I may upgrade if I need to, but would like to test drive it (when the demo comes out) before doing that since I have some legacy software that will not run beyond 10.12. Thanks!I have been trying to find an alternative to Pepakura on Mac for a long time, but could not find any. So I created one. Unfolder - Create papercraft easily