Thanks for letting us know. A quick search found this article: https://learn.microsoft.com/en-us/mem/configmgr/core/plan-design/security/enable-tls-1-2-client According to the article Windows 8.1 already supports TLS 1.2 natively. Although you may need to enable it by setting registry entries. Still, upgrading to Windows 10 is probably the better option.