If the Beta dropdown is missing, use the Steam console:
If you own the game on Steam, the update should begin automatically. If not, simply restart your Steam client or check the "Downloads" tab. Euro Truck Simulator 2 Update 1.43 Download
If you purchased the game from the SCS Software website or another digital storefront, you can download the update directly from the SCS Software website. Here's how: If the Beta dropdown is missing, use the