First of all, delete or rename the Wayfinder snippet folder (assets/snippets/wayfinder) and upload the WayFinder folder from your install package again.
That should ensure that all files are there and that they are realy the new ones.
Your update - did you delete all files on the server or overwrite them ?
It is known that in some cases older files are not overwritten by new files, so that could possibly be your problem