After more than 10 years of development KVIrc is a mature and full featured IRC client, an excellent companion for your daily IRC sessions.
The latest stable release is 4.2.0 "Equilibrium".
It has been published on July 03, 2012.
It can be obtained in source form from the download page.
If you are looking for official releases have a look at this section, those are released less often but are most stable. Choose your release between Linux, Windows, MacOS X or source package.
Snapshots are located here while SVN are found here.
Also be sure to check for installation notes, tutorials, translations and themes for a more customized version of your KVIrc =)
if you need any help the fastest way is to refer to the KVIrc public mailing list
or join dedicated channels
bugs can be reported and viewed by using the KVIrc bugtrack system available at the KVIrc bugtrack
KVIrc official documentation
autogenerated index query
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