The *NIX/Source download has been replaced with 188.8.131.52. This version only fixes a compile problem on FreeBSD and OpenBSD. Other than that there were no changes. If you are using Linux or Windows then there's no reason to upgrade. In fact, the Windows version is still 4.0.3.
For information on the changes between 4.0.2 and 4.0.3, see the UnrealIRCd 4.0.3 release announcement.
News about the UnrealIRCd project, including release announcements
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