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Beta 3 came out in 2014 edit
http://www.geocities.jp/daichi1969/synmanu/readmeeng.html#rireki "Ver1.13 beta3 (2014.7.10)"
The reason I didn't edit the main article is that I don't know enough about the topic, but clearly there's a new sub-version. It's still at 1.13, but it says beta 3, and the release is newer than the 2012 release mentioned under "History", in the article.