Here you have working version with download code:
Extended vtour example demotour-corfu (excluding scene/thumbs)
Important: In tour.xml where you scenes are define new attribute: include_thumb="false"
vtoursking.xml is changed a lot to be able to work. Or you use version I share or adapt it manually.
Actions that are changed: skin_addthumbs, skin_update_scene_infos, skin_nextscene,
New actions: find_next_scene
But be carefull. With new version of Krpano vtoruskin.xml is changed a lot. Specially with support for VR. That saying I would suggest take latest version and try to update it based on my vtrouskin as that time when I did this code Krpano was 1.17 so there could be a lot of changes.