[loosescrews]

I think you are talking about an upgrade install. Those have a long history of breaking things. You would have to be crazy to attempt one of those on a critical production system.

What you would do for anything important is build a new separate system and then migrate to that once it is working. You can then migrate back if you discover issues too.

[icedchai]

Yes. These sorts of upgrades were done on my home network, not an actual work-related system.