I suggest that you call into the support department at 1-800-821-2797 and speak with an analyst to see why it keeps failing.
I am unable to successfully download the Workcentre 6515 65.74.51 firmware update from https://www.support.xerox.com/en-us/product/workcentre-6515/content/161428?language=en for macOS 12 - Monterey
The download progresses to near the end and then fails. I've tried repeatedly with three different browsers Safari 17.3, Firefox 122.0 and Brave v1.62.156 -- all three give the same behaviour. I'm running macOS 12.7.3 on an intel iMac.
How can I download the new driver? Thanks.