color-grading Davinci Resolve vs Mac vs Nvidia

I can't use resolve on my mac because it's not OS 10.13. I can't download it because my Nvidia graphics card, very necessary for large footage, wont work with the OSX Mojave. Apple is refusing to collaborate with Nvidia or something, and it's not allowing me to do color grading. If you have a moment, please sign this petition in the link to get apple's attention.

Does anyone know how I can download resolve if I don't have OS 10.13? Maybe a place I can download an older version.