I have a requirement to install Web8 core then update it to web8.1.1 The directory structure of Web 8 installation media does not match with the SDL web 8 insallation

In SDL Documentation there should be a setenv.ps1,quickinstall.ps1 and some configuration files in Content Delivery\resources\quickinstall\

path and session microservice in Content Delivery\roles\ folder which are missing

If anyone can help me out to either get the missing files/Folder or provide me documentation tosetup Web 8 Core