The NoMagic web site has a 2018 version which is exactly the same as the 2013 version (except changing the "3" in 2013 to an "8" to become 2018). Meanwhile, SysML itself has gone from version 1.3 (June 2012) to 1.6 (December 2019). Here is the link to the guides: https://docs.nomagic.com/display/NMDOC/Quick+Reference+Guides

For reference, here is the link to the releases of past SysML versions: About the OMG System Modeling Language Specification Version 2.0 beta