Please follow these steps to install and activate your Windows Server 2016 Standard license:
1. Download Windows Server 2016 from Microsoft:
https://go.microsoft.com/fwlink/p/?LinkID=2195174&clcid=0x409
2. On the page, select Windows Server 2016 and download the ISO image.
3. Create a bootable USB or DVD using the ISO file and install Windows Server.
4. After installation, open Command Prompt as administrator and run the following command:
Dism /online /Set-Edition:ServerStandard /AcceptEula /ProductKey:XXXXX-XXXXX-XXXXX-XXXXX-XXXXX
Replace the X with the license key we sent you by email.