Despite being an older version, Visual Studio 2019 (version 16) is still officially supported through Microsoft's Fixed Lifecycle Policy . It is known for:
If you get an error, ensure your system date/time is correct and that you have internet connectivity. For offline activations, contact Microsoft support. microsoft visual studio 2019 download
If you need an offline installer (for machines without internet or multiple installations), you can download the full layout via the command line using the bootstrapper with --layout switch. That is an advanced topic, but official Microsoft documentation covers it. Despite being an older version, Visual Studio 2019