I have tried to install QCad pro 3.29.6 to a mac with a 2.9 GHz dual-core Intel core i5 processor running Version 12.7.5 The installation went OK it seems. But when I try to launch it, I get an error message saying: “QCAD-Pro” cannot be opened because the developer cannot be verified. macOS cannot verify that this app is free from malware.