How to get Post Processing in Unity 5.6.7f1

Since Post Processing Stack is removed from the asset store, and Package Manager doesnt exist in Unity 5.6.7f1 I dont know how to get post processing in my game. I cant upgrade to a newer version because my laptop is 32byte.

you can find it in github, you will need to locate the versions for your specific uinty version, read the md for instructions