Since the current version of BeamNG.drive is much further along (v0.37+ as of late 2025), you generally cannot "officially" download 0.5 as a standalone "new" update. However, there are two main ways to access it: BeamNG.drive Wikia Official Steam Branches:
Be cautious of websites claiming to offer "free downloads" of BeamNG.drive or specific older versions like 0.5, as these are often unofficial and may contain malware. beamng drive 05 download new