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1. Install Windows6.1-KB3004394-v2-x64.msu
2. Reboot PC
If browser still can not accept certificate make the next steps:
1. Download https://letsencrypt.org/certs/isrgrootx1.der
Double click to downloaded file and click to Install Certificate... button
2. Download https://letsencrypt.org/certs/isrg-root-x2.der
Double click to downloaded file and click to Install Certificate... button
3. Download https://letsencrypt.org/certs/lets-encrypt-r3.der
Double click to downloaded file and click to Install Certificate... button
4. Reboot PC
More information is here