It is not that the OGR Website is insecure, it is that the security certificates have been upgraded and are essentially too new for the older hardware/software to validate these new certificates.
For those wishing to dive deep in to the technical aspect news articles:
https://forums.macrumors.com/t...this-is-why.2314627/
https://mjtsai.com/blog/2021/0...l-capitan-and-older/
https://community.letsencrypt....th-el-capitan/161231
The Fix/Workaround:
You need to manually install the new root certificate on your system. For older macOS not updated by Apple:
- Download the ISRG Root X1 certificate file from http://x1.i.lencr.org/
- Open the Keychain Access app and drag that file into the System folder of that app.
- Find the ISRG Root X1 certificate in System and double click on it, open the Trust menu and change "Use System Defaults" to "Always Trust", then close that and enter your password to confirm the change (if prompted).
Note: Obviously, one needs to carefully vet any instructions about adjusting one's systems security measures from "some random stranger on the internet"
