UPDATE: RSA 2026 has just been released. I installed it on a Mac Studio M4 Max (running the latest Sequoia) with VMware Fusion 13.6 and it seems to work! There's a caveat, though: When you use the 3D view, it will crash unless you previously go to general preferences, and in the OpenGL view settings, set the acceleration slider down to the minimum possible value. By doing that, I've been able to model a complete steel structure, adding loads, simulating wind, and calculating it (but I didn't have time to go into steel design, though).
By the way, there's something I did different to previous installs of Robot in this Mac: I started Robot as soon as the installer let me (you know that in recent versions of Robot, the installer lets you launch Robot before the installation finishes --I did that, the window for the license appeared, I entered my credentials, and then Robot 2026 started, to my great surprise). Just before 2026 was released, I tried to install 2025. It didn't work (it quits just after the splash screen appears), but I didn't launch it until the installer finished completely. I'm saying this because I don't know if the "early launch" was what made 2026 work, or if it's that this version actually works on ARM after 3 versions in a row that didn't work.