Is this caused by Avast?

[wdsellers]

every link people have sent wont allow me to go to the site.
can anyone download the certs and send them in a ZIP?

[Asyn]

every link people have sent wont allow me to go to the site.

As said, download the certs on another device and copy them over.

[bob3160]

every link people have sent wont allow me to go to the site.

As said, download the certs on another device and copy them over.

Download it to a flash drive once downloaded, take that flash drive to the affected system.

[wdsellers]

i have this one computer and flash drive, nothing works. i give up

[Asyn]

i have this one computer and flash drive, nothing works. i give up

How about family/friends/neighbors, can't you download it there..?

[wdsellers]

just got the certs from someone, downloaded, installed, rebooted, no change

[Erick872]

Is it possible that you imported the certificate in a wrong directory? I'm asking because it happened to me, and then I followed this article (step 6) and it started working: https://techglimpse.com/dst-root-ca-x3-expired-certificate-error/

[wdsellers]

that link caused the same bad cert error

[redwolfe_98]

Is it possible that you imported the certificate in a wrong directory? I'm asking because it happened to me, and then I followed this article (step 6) and it started working: https://techglimpse.com/dst-root-ca-x3-expired-certificate-error/

here are the instructions for installing the new, updated root-certificate-file that is needed, according to "techglimpse." the file's name, from "letsencrypt,"  is "isrgrootx1.der."

doubleclick the file to install it and, when installing it, choose "Place all certificates in the following store" and choose "Trusted Root Certification Authorities."

incidentally, the techglimpse article mentions that up-to-date versions of the firefox browser are not affected by the issue since firefox has its own set of root-certificates, which would be up-to-date.