The basic difference is Setup.exe is being used by Sitecore install assistant (GUI for easy Sitecore setup) whereas XP0-SingleDeveloper.ps1 is used by Sitecore Install Framework (Developer friendly method using PowerShell to install Sitecore).
You need to update the files according to your choice of installation method.
If it is Sitecore only you are installing, you just need to change the setup.exe.config.
Open the setup.exe.config and add this parameter to the XPSingle template (if that is what you are installing):
<template name="XPSingle" path=".\XP0-SingleDeveloper.json">
<parameter name="SitePhysicalRoot" value="[your-path]" />
I was able to find a more elegant, complete solution to my previous answer: https://sitecore.stackexchange.com/a/20041/556
My work laptop has many settings restricted by my organization. One of which is my proxy settings.
From Windows search for "Proxy Settings":
This illustrated to me that my machine wasn't fully in my control.
Next, thanks to some ...