If you have purchased SimpleDiagams in the past, you can download the version you need on this page.
If you want to just try out SimpleDiagrams, please use the Trial page.
Read about bug fixes and new features here: Product History
Behind the scenes, SimpleDiagrams uses Adobe AIR to make it easy for me to make a great cross-platform app. So if you want to know the base system requirements for SimpleDigrams, please review Adobe AIR's system requirements.
I love Linux. I want to publish a version for Linux. Please email Adobe and ask them why they dropped Linux support for AIR.