certificate update for old Macs

[Riccardo Mottola via macports-users]

Hi,

how to react best for Let's Encrypt expiration?
I have read here some suggestions, is there a recommended, proven way?

I have MacOS 10.5, 10.6, 10.7 but nothing newer, so I suppose the route 
of "getting it from a newer macOS" is no way for me (if something 
doesn't share it with me).

Other proven ways?


Thank you,

Riccardo