@skullmonkey While it is not the latest version 20.x you can get 19.x (currently 19.5) like mentioned here:

https://retropie.org.uk/forum/topic/34508/updating-kodi/13

I have update a system from RetroPie 4.7.1 to 4.8 without issue. Better configure the system after the update to 4.8.

@connormalc Raspbian is just a linux distro with specific Raspberry Pi bits, for x86 hardware I'd install another distro which might be better supported on the PC. PIXEL is the name of the former desktop environment for Raspbian, I don't see how that would help you, maybe you meant NOOBS ?
I'd advise using bootcamp to try out Ubuntu - get the LTS 18.04 version - and install RetroPie on Ubuntu as explained in the Docs.
RetroPie does not run on Windows and while Emulationstation and most of the emulators run also on Windows, it would take some time to manually configure them to work together.

@retrocraze The manual method of using USB as ROM source should work.

@chrissphinx Please do not post a support request without first reading and following the advice in https://retropie.org.uk/forum/topic/3/read-this-first

Make sure you are using an official image, or have done a manual install yourself. We will not support 3rd party images.

Oh how do I launch into Kodi first and exit to emulation station?

Hello, I'm doing the same thing but don't know how.
Did you ever figure it out?