Open Server Manager, click Manage and select Add Roles and Features.
Click 2 times Next, select the server you want to install new role/feature and click Next. Scroll down and select Windows Server Update Services
Click Add Features to install the features that WSUS needs. When the popup closes click Next.
Click 3 times Next. Specify a location to store the updates and click 3 times Next. Then click Finish to install the WSUS role
You can install WSUS role with PowerShell too:
#this includes the connectivity role service. install-windowsfeature -name updateservices -includemanagementTools #use this in case you want to use a seperate SQL server install.windowsfeature -name updateservice-services,updateservices-db -includemanagementTools
After installation, you need to configure the WSUS. Read the next post!