: If you have an active subscription, the Exchange 2019 ISO is available under the "Downloads" section. Cumulative Updates (CU) : For existing installations, Microsoft releases Cumulative Updates

Run setup.exe /PrepareSchema , /PrepareAD , and /PrepareDomain from the command line on your domain controller to update your directory before firing up the installer.

Only the 180-day trial is free. Production use requires a purchased license (Standard or Enterprise) through a volume licensing agreement.

Why download the ISO when Microsoft pushes cloud? Consider this matrix: