Patch 1.0.877.1 is a legacy version of the game. Many players on older hardware, pirated copies, or those seeking absolute stability with older, discontinued mods intentionally freeze their game updates on this patch.
: Specifically targeting the "Add-On Crash" that occurs when the game's internal pool sizes are exceeded. Core Requirements for Installation 108771 gameconfig link
If you play LSPDFR, they have a curated gameconfig under their "Downloads > Essential Mods" section. Patch 1