Modders are currently working on an API that works with 1.5.īefore you do anything, the first thing you're going to need to do is download and install the modding API. **Update 6/22/21: Hollow Knight was recently updated to version 1.5! Mods will not work properly unless you downpatch the game to version 1.4.3.2, found in Steam by right-clicking the game > Properties > Betas > choose 1.4.3.2.