A .zip file of this name typically contains the full standalone game directory for the Windows platform.
The game was updated to a newer version of the Unity engine, which improved overall performance and provided native support for newer hardware. File: Hollow.Knight.v1.5.75.11827.zip ...
The compressed download is approximately 3.1 GB . The version number "1
The version number "1.5.x" signifies a significant engine transition for the game: File: Hollow.Knight.v1.5.75.11827.zip ...
Fixed a bug that prevented language settings from saving correctly when changed while inside the game. Context: The v1.5 "Unity Update"
This specific sub-version was a minor stability patch following the primary v1.5 release. It focused on two critical quality-of-life fixes:
Resolved an issue where the Godmaster "Pantheons" would get stuck at the end screen if the player was not using a controller.