WARNING: cannot verify download.manjaro.org's certificate

--2021-10-06 22:22:53--  (try: 2)  https://download.manjaro.org/deepin/21.1.2/manjaro-deepin-21.1.2-210907-linux513.iso
Connecting to download.manjaro.org (download.manjaro.org)|89.187.187.15|:443... connected.
WARNING: cannot verify download.manjaro.org's certificate, issued by ‘CN=R3,O=Let's Encrypt,C=US’:
  Unable to locally verify the issuer's authority.

Are you by chance on an older operating system, like Ubuntu 18.XX or below?

Lets Encrypt changed their root certificate recently and the old one (which is present in older installs) is not valid anymore.

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