If you have the original DVD version (pre-Steam mandatory), you cannot get 1.16.3 officially, as Kunos stopped supporting the disc version at 1.10. You have two choices:
Since Assetto Corsa is a Steam-only title, the patch downloads automatically. If you are still on an older version, force the update: Assetto Corsa 1.16 3 Patch Download
Avoid them. Websites offering standalone .exe patch files for Assetto Corsa 1.16.3 are almost always: If you have the original DVD version (pre-Steam
The only safe, functional method is through Steam. Since Assetto Corsa is a Steam-only title, the
Even a polished patch can cause hiccups. Here are the most common problems users report after the Assetto Corsa 1.16.3 patch download and how to fix them.