If you're unable to download the ISO file from the Microsoft Evaluation Center, you can try the following alternative methods:
Exchange Server 2019 is supported on:
The download will begin. File size is typically ~1.6 GB to 2.2 GB depending on cumulative update. Microsoft Exchange Server 2019 Iso Download
If your organization has a Volume Licensing agreement (Enterprise Agreement, MPSA, or Select Plus): If you're unable to download the ISO file
After downloading the Exchange Server 2019 ISO file, follow these steps to install and activate the software: Microsoft Exchange Server 2019 Iso Download