The latest stable is UnrealIRCd 5. UnrealIRCd 3.2.x is no longer supported (for years already) and UnrealIRCd 4.x will no longer be supported after December 31, 2020. We recommend everyone to switch to UnrealIRCd 5 soon, if you are not already using it.
More information about current and future releases can be found at https://www.unrealircd.org/docs/FAQ#What_is_the_current_version_and_when_will_next_version_be_released.3F
We really appreciate it when you report bugs and feature suggestions here, this helps us to fix issues and move UnrealIRCd forward. If you are in need of support, however, then please use the forums https://forums.unrealircd.org/ or IRC Support channel ircs://irc.unrealircd.org:6697/unreal-support instead. Also don't forget to check out our excellent support resources: