i watched how to open project. question: do i need unity 2019 or does the kit work on unity 5.3.1 just question. what does this kit actually work on unity project because im suffering some error about vaild gameobject which i dont know that.
You need 2019.3 or newer version of engine. If you use newer versions (2020 and up), then you may need to fix some errors, due changes in Unity engine.
no i don't blame on your project that was made 5 years ago and now im installing 2019 from unity hub so 2019 unity can create desktop. anyways thanks now i can upload the build oh and problem is. is there enemy ai in this kit? if there arent enemy ai thats ok.