I have a mac mini with OS X 10,11,6 and when I try to start the app I get the notification that my OS is too old. Unfortunately because my MAC mini is pre 2013 I can’t upgrade OS. Is there any other ways to run the app?
Maybe an older version that can run on OS X10,11,6?
SketchUp Free, which Kaiden linked to, will work in your browser and is less dependent on the operating system version. You can run it in Chrome or Firefox. Your profile indicates you are trying to use SketchUp Make so presumably you are using it as a hobbyist. SketchUp Free should work for you.
All the native tools are there. It doesn’t support extensions but the native tools are quite powerful. It’s certainly got more tools than you have access to in SketchUp 2017 Make with your current computer.