trav1s

that's why it didn't work.

Thank you sir! Last time I installed it, I pressed the automatic installation. Thank you all very much for your help.

It didn't help either

Installed ISRG Root X2 and deleted DST Root CA X3 and restarted the computer - did not help.

Done. Did not help. You righ sir, your website works good. https://trends.builtwith.com/websitelist/LetsEncrypt - this no

I downloaded isrg-root-x1-cross-signed.der and installed it. It did not help

I am using Windows 10. I have DST Root CA X3. ISRG Root X1 - i don't have

Here's what I found here

Hello! Did it just now. Did not help.

The first 2 methods did not help (

No. No, because you said it was not safe to use.

Yes sir. Even when using VPN - the same problem/ without VPN too OperaGX with VPN (screenshot below). For example in the Mozilla Firefox Browser with VPN or without i don't have a such problem with SSL-certificates (screensholt below)

It did not help(

Another important question - Did you use the Registry Cleaner tool in CCleaner? - Yes. Is this happening for ALL websites or just some? - For most websites. For example - https://stackoverflow.com/ - NET::ERR_CERT_DATE_INVALID with many other sites similarly With YT/GOOGLE/Twitch i don't have such a problem.

in most cases, the sites that I visited BEFORE starting the cleaning do not work. Although some sites that I have not visited before do not work. I tried to open a site in the OperaGX browser on which the SSL-certificate does not work for me with the VPN enabled from the opera - it did not help