: 1.4.3517 addressed several underlying issues in the C# and XML codebases to help modders keep their content compatible with the evolving 1.4 framework. Notable Features in the 1.4 Era
As part of the broader 1.4 update landscape, this version supported: RimWorld v1.4.3517
For players still running this specific version, it's generally recommended to update to the latest stable release (currently in the 1.5+ range) to benefit from even more significant performance overhauls and new content. Vanilla Apparel Expanded - Steam Workshop : Core Biotech features that allowed players to
: This version improved game stability, specifically targeting performance issues that arose with the new pollution and tox mechanics introduced in the Biotech expansion. RimWorld v1.4.3517
: Core Biotech features that allowed players to engineer custom xenohumans and manage colony families.
: Refinements were made to the then-new security buildings, such as the Foam Turret (which suppresses fires) and the Rocketswarm Launcher (effective against large groups of unarmored enemies).