If you register on Planet-9.com (2 minute job), there's a 03/2014 pdf version (WKD 981 06 21 15) available for download in the Files / Boxster Documents section. I think it's a US version and is slightly different to my UK version. It covers the Boxster, S & GTS but (unlike my UK 2015 version) doesn't cover the Spyder. There are some different sections in it too (eg a few paragraphs at the beginning about track driving!) but I'm sure it's close enough for your purposes. There are other