Connect to the network and run Windows Update. Server 2019 has had several major cumulative updates. It is vital to install the latest Servicing Stack Update (SSU) and Cumulative Update (LCU) to patch security vulnerabilities.
If the server was not activated during install, use the following command in PowerShell (run as Administrator) or Command Prompt: slmgr /ipk [YOUR-PRODUCT-KEY] Followed by: slmgr /ato server 2019 standard download
Upon logging into the Desktop Experience, the Server Manager dashboard launches automatically. Connect to the network and run Windows Update
Disclaimer: This post is for educational purposes. Ensure compliance with Microsoft licensing terms for your specific use case. server 2019 standard download