Here is an updated Unity package for the last known version that works with the PS Vita, 2018.2.19f1. This package configures all the inputs for the PS Vita at the click of a button, so you don't have to browse through tons of old forums trying to figure out the input mappings. This release addresses an issue with importing an event system into Unity 2018. 2. 19 F1 that causes missing script errors on the event system.