How to Download SQL Server 2019 ISO (Official & Safe Methods)
If you need to install Microsoft SQL Server 2019 in an offline environment, on multiple servers, or simply prefer a physical media backup, the ISO image is the best option. Unlike the online bootstrapper, the ISO contains all the core installation files.
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If you only have an internet connection during installation, consider using the online bootstrapper (small .exe file) instead of the ISO. But for offline, air-gapped, or repeat deployments — the ISO is your best friend.
Below is the step-by-step guide to downloading the official SQL Server 2019 ISO from Microsoft.