Proteus 8 Professional 8.3 SP2 Build 19906 Proteus 8.3 is the latest release of the Proteus Design Suite CAD Software. It includes: Support for MCAD data exchange via STEP and IGES file formats. Import component STEP/IGES files for the parts in your project or describe them with a simple scripting language. Export the resulting STEP Assembly for loading into your MCAD tool of choice. Support for multiple track editing operations and enhancements to track necking. Enhanced support for design re-use via sub-circuit binding on the Replicate command. Addition of the MSP430G2X variant set and the PIC1845K50, together with the ILI9341 TFT display.