For most plugins, one should be able to go to Advanced View in the plugin’s details sidebar (https://wordpress.org/plugins/email-before-download/advanced/) and then use the Previous Versions section’s dropdown to download past versions. However, this plugin has unfortunately not been providing the tagged versions via its SVN repository as of version 5.1.9 for some strange reason/oversight per https://plugins.trac.wordpress.org/browser/email-before-download/tags (it was being done properly & consistently at some point before… why’d it stop? It’s a very useful feature that only takes a moment to tag a version to then be made available this way so it’s really not great to find that stopped being done for whatever reason.) Also, having the plugin on GitHub with tagged version releases there would be a great secondary method of providing this (while then getting all of the other benefits of GitHub as well for community patches/support, etc.)
As is often the case for something like this, it seems like Archive.org’s Wayback Machine can thankfully come to the rescue. Going to https://web.archive.org/web/20210326103442/https://wordpress.org/plugins/email-before-download/ should offer the plugin page for when it was version 6.2, and it does appear that the Download button on that page does indeed serve up an archived copy of Email Before Download 6.2 (having archive.org store a particular version’s download file really isn’t something to rely on, but sometimes it can really come in clutch.)