3DCoat 4.9 BETA testing thread in Beta Releases Posted Monday at 04:45 AM · Report reply 17 hours ago, SERGYI said: Intel MKL requires macOS 10.13 (MKL is used for retopo, uv unwrap, etc.). Most probably "3DCoat 4.9.34" doesn't run on your machine because it is not signed yet. We are currently sorting out the signing process. Please try the next upload. Thanks Sergyi, I am running 10.13.6 so as long as that's the most recent requirement hopefully all will be well. I was able to launch via security preferences to bypass the signing problem, I thought. But fingers crossed, I'll give the next build a try.