The transition from version 1.4 to 1.5 introduced several "under the hood" changes to the engine. While 1.5 improved compatibility for modern hardware, it broke many popular mods.
Right-click Hollow Knight in your Steam library, go to Properties, then Betas. You can often find legacy versions listed there. hollow knight 1432 download exclusive
If you own the game legally, you don't need a shady "exclusive" download link to access older versions like 1.4.3.2. The transition from version 1