so do I need to follow both manuals the nwjs and the suction js?
You must use version 0.49.2 of nwjs, updating manually so that the RPG maker uses that version instead of the one that comes from the factory. Different versions are very likely not to work as they should. The process is actually quite simple, it's more text than anything else honestly.
Check out here:
https://forums.rpgmakerweb.com/index.php?threads/how-to-update-nw-js-to-dramatic...