Microsoft Exchange Server 2019 CU3 X64 MSDN Free PATCHED Download
To get the latest version of Exchange 2019, download and install Cumulative Update 12 for Exchange Server 2019. Each CU is a full installation of Exchange that includes all updates and changes from previous CUs. When installing a new Exchange server using the latest released CU, you don't need to install Exchange RTM or any previously released CU.
Microsoft Exchange Server 2019 CU3 x64 MSDN Free Download