How to enable TLS1.2 for port 1433 I have received vulnerability on Microsoft SQL server 2008 (RTM)


  [high] [1433/tcp/mssql] TLS Version 1.2 Protocol Not Enabled
  TLS v1.2 is not enabled on this port.


Already enabled TLS 1.2 on OS level (Windows Server 2008 R2).

below are the details Product version:
Microsoft SQL server 2008 (RTM) - 10.0.1600.22(x64) 
Product level: RTM Product Edition : Express edition(64bit) 
Whether I need to go for SQL Server 2008 SP4 10.0.6547.0(First build supports TLS 1.2) 

Please let me know how to resolve this issue.
There is this KB article, which lists the required updates you need to install https://support.microsoft.com/en-us/kb/3135244 , which also lists which updates are needed on the client machines trying to connect to a TLS 1.2 enabled SQL Server.

Also, read http://blogs.sqlsentry.com/aaronbertrand/tls-1-2-support-read-first/ , which lists known problems and caveats. It states


  It seems straightforward, but as of today, not all builds will enable you to rush out and convert to TLS 1.2 exclusively