I am attempting to update my Exchange 2013 server that is currently on CU7 to CU22. When I attempt to install CU22, it prompts me for the CU7 installer file which I no longer have. It used to be available as a download here: https://support.microsoft.com/en-us/help/2986485/cumulative-update-7-for-exchange-server-2013
But has since been removed. I cannot proceed with this upgrade without this file, which I have been told is only available from Microsoft.
Thank you,
Jonathan