Of course there still is the problem of how you could benefit from this fix, as the server will only show the no-longer existing version of betzaNew.js to its users. A trick that worked for me is to add the suffix ?t=XXX to the link to betzaNew.js, with XXX a string that was never used before.
For me it sufficed to press Ctrl-F5 to update the browser's cache (Microsoft Edge).
For me it sufficed to press Ctrl-F5 to update the browser's cache (Microsoft Edge).