The "Maths" engine is now more efficient. You can write complex expressions (like aerodynamic drag coefficients or live tire degradation models) with less CPU lag.
The update package may not automatically replace the manual. Download the wintax 4 user manual upd separately from the website and manually replace the old PDF. Default location: C:\Program Files\Wintax4\Docs\ . wintax 4 user manual upd