If you are looking for a "free download" specifically, check these official platforms where the game is often included in a library:
: Days Gone is frequently included in the PlayStation Plus Extra and Premium catalogs. Days Gone Free Download v1.06
While is not a free-to-play game, there are legitimate ways to play it without additional cost if you have certain subscriptions, or to find it at significant discounts. Official Ways to Play for "Free" If you are looking for a "free download"
The v1.06 update you mentioned is a specific patch released to improve performance and stability. Days Gone Free Download v1.06