The link to the release notes of v. 4.2 on Revive's download page is broken and leads to: https://www.revive-adserver.com/blog/revive-adserver-v4-2-0-released-bug-security-fixes/
The right link is: https://www.revive-adserver.com/blog/revive-adserver-v4-2-released-bug-security-fixes/