Move Post-Install folder to Desktop and run after you're already finished installing macOS. It will help to fix the output and input audio when you plug 3.5mm headphone/headset/external speaker in and improve sleep.
If you want to use HiDPI, do with the same way like Post-Install folder: Move HiDPI folder to Desktop and run the script.
Note: There is a small issue with HiDPI if you scale up the resolution: Apple logo will be big at booting, and the screen will be glitch when shutdown/restart. This issue cannot be solved because the current resolution is fake.