Ensure your Exchange environment has Extended Protection enabled via the official Microsoft ExchangeExtendedProtectionManagement.ps1 script available on GitHub.
Microsoft Exchange Server 2016 Download 64-Bit ISO: The Complete Deployment Guide microsoft exchange server 2016 download 64 bit iso fixed new
Run a cryptographic hash check (SHA-256) on the downloaded file. Match it against Microsoft's documented value to verify the ISO is uncorrupted. Preparing Your Environment for a "Fixed & New" Setup microsoft exchange server 2016 download 64 bit iso fixed new
Before running the installer on Windows Server 2016, run PowerShell as an administrator to install required windows features: Exchange Server supportability matrix - Microsoft Learn microsoft exchange server 2016 download 64 bit iso fixed new