✅ – Service Pack 2 of Proteus 8.9 is known to be more stable than earlier 8.x releases, with fewer crashes during simulation.
❌ – Bundled Arduino 1.8.x is old (current is 2.x). Missing new boards, libraries, and features like the built-in debugger. Proteus 8.9 Sp2 Professional With Arduino 1.8 UPD Free
❌ – Large sketches with many virtual components can slow simulation significantly. ✅ – Service Pack 2 of Proteus 8