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Not sure about ordering one but you can collect it from the Asociacion de Amigos in Alicante. Their guide is excellent and was revised last year. All in Spanish but the maps and other stage info is easy to read.
I believe official Camino Manchego is only from Ciudad Real to Toledo and then sucked into other Caminos. Well, until now. I have a different plan with Manchego and that is walking Toledo-Avila on Levante (which I didn't yet) and then Camino Teresiano to Salamanca, Camino Torres to Ponte de Lima (Portugal) and on Portugues Central to SdC. Sureste being left for walking in its entirety.
BUT what's interesting or even important for me about the guide you posted is the stage between Benavente and Sta.Marta de Tera (page 118) which I haven't find anywhere although I know it's marked. Few weeks ago I suggested that "shortcut" from Frances to Sanabres to a forum member but unfortunately forgot who that was.
Hello I walked the Sureste this year in May. I walked from Alicante to Avila. I used this guide which is in English, it is an 2017 publication and I found it good. It covers from Alicante to Benavente. Here is the link. You will also pick up up useful maps and info from the Albergues as you go. https://www.csj.org.uk/product/pilgrim-guide-camino-del-sureste/ I attach a couple of photographs to give you a feel for the route. Regards Dermot (Nalod)