I was able to successfully roll users back to 22.6.0.142 until the issue is resolved.
Here is a Norton post showing the download links for the various versions of 22.7.0.76:
[url]https://community.norton.com/en/forums/227-download-links[/url]
You can reverse engineer these to the correct version of 22.6.0.142 by changing the URLs, for example:
http://buy-download.norton.com/downloads/2015/22.7/N360/US/N360-ESD-22.7.0.76-EN.exe
becomes
http://buy-download.norton.com/downloads/2015/22.6/N360/US/N360-ESD-22.6.0.142-EN.exe
I recommend using the Norton Uninstall tool to wipe all traces of the software before installing the older version. After installing 22.6, there is a setting that prevents the software from automatically upgrading back to 22.7.
In terms of other options, just yesterday some of our users with McAfee are unable to get in, and we advised them to switch to the free version of Avira until we get the McAfee issue resolved.