Version 2.8.7 released the 20th of last month has been superseded with 2.8.7a Zed announced on the XChat homepage.
This new version is mainly a bugfix release, as the changelog shows.
The XChat Windows release is shareware. Freeware versions are still being released from the otherwise still available opensource code. One such release is from Silverex but is an older release, 2.8.4.