Can I use my version of MacDraft Pro (6.0.6) if I update to macOS Sierra?
On the App Store, the software is listed as being compatible with the OS X 10.6.6 or later. However, the latest version is 6.2 and was released somewhere in September, therefore you have to update to the latest version as well.
I don't think it's possible to run version 6.0.6 on Mac Sierra.