When this happened to me two updates ago, I had to end the update, pause my antivirus software (both Avast and Malware Bytes, but didn’t troubleshoot which was the culprit), then restart the update. This ended a perpetual: download > decompress 95% > auto-restart download > decompress 95% > auto-restart download > …
Of course, unpause your antivirus software after success or continued failure.