Pretty much running this program as brand new, steps I have done.
1. Extracted stellar and opened it
2. Selected my retroarch folder
3. left default for download and architecture type (RA+Cores | 64-bit) and the download URL
4. clicked "check"
4.1. it throws the errors I mentioned
4.2 if I click on "ok" on both errors it comes up with the checklist with my cores that I have
5. I click on "update" and it throws the errors I mentioned again and then sits in an endless thing of "fetching cores list"