To check for updates, take the following steps:
Using Server Manager
Step 1 : Open Server Manager from the Start menu. And select Local Server.
Step 2 : In the Properties section, click the highlighted Last checked for updates setting.
Step 3 : In the Settings window on the right-hand side of the Windows Update section, the available updates are listed (if any). If any updates are ready for installation, then click the Install now button.
Step 4 : Installing updates might take some time! When the installation is done, often, you will be asked to restart the server for the updates to take place.
Using Server Configuration
Step 1 : Type Sconfig.cmd, and then press ENTER. The Server Configuration tool interface opens.
Step 2 : Enter 6 as a selected option and press Enter.
Step 3 : In a new window, enter A for all or R for recommended updates and press Enter.
Step 4 : After a short time, Windows Update starts searching for updates.
Step 5 : If applicable updates are found, then enter A for all, N for no updates, or S for single update, and press Enter.
Step 6 : When the updates are downloaded, the installation takes place. Click Yes to restart your server.