Versions

LyX 0.7.0 was released on October 24, 1995. LyX 1.0.0 was released on February 1, 1999. LyX 1.2.0 was released on May 29, 2002. LyX 1.3.0 was released on February 7, 2003. LyX 1.4.0 was released on March 8, 2006. LyX 1.5.0 was released on July 27, 2007. LyX 1.6.0 was released on November 10, 2008. LyX 2.0.0 was released on May 8, 2011. LyX 2.0.1 was released on September 5, 2011. LyX 2.0.2 was released on November 30, 2011. LyX 2.0.3 was released on March 1, 2012. LyX 2.0.4 was released on July 2, 2012. LyX 2.0.5 was released on November 11, 2012. LyX 2.0.6 was released on May 9, 2013.

Besides the main distribution of LyX which requires installation, there's also an unofficial portable version integrated with TeXLive called LyTeX.