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No, it isn't, there was earlier public draft release (0.5) in February 2015. https://web.archive.org/web/20150301065655/http://lightning.network/lightning-network-paper-draft-0.5.pdf
Do you know why they no longer mention this version on the official website?
No, it isn't, there was earlier public draft release (0.5) in February 2015. https://web.archive.org/web/20150301065655/http://lightning.network/lightning-network-paper-draft-0.5.pdf