I didn't make a main video this week, so make a little short!
Let's Encrypt's root certificate expired at the end of September, and while modern machines will simply update automatically with the new certificate, unsupported operating systems will not. This is why Macs 10.11 and older suddenly throw random SSL errors everywhere. The solution is to download the new certificate from https://letsencrypt.org/certs/isrgrootx1.der and manually install it in Keychain Access.
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