The current version is 2.3.6 build 2362. Please download the iRed2.zip package (about 3.2 MB). You may have a look at the Release Notes.
All updates of iRed2 will be announced by the built-in Software Update mechanism (Sparkle, by Andy Matuschak), until you have switched automatic version checking off in iRed2's preferences.
Trouble with new version?
If you ran into problems with the new version, you may have more luck with the version before: "download last version". Please tell me what went wrong!