[Obsidian Dragon]

Wow. What an ordeal. To others attempting this, I strongly suggest doing it with a separate drive (SSD). Perhaps clone your drive first. The main point is to have a viable system restore process in place before proceeding. Some of us advocate that you are not backed up until you have two independent backups stored in different places. We may be paranoid, but it has saved us in the past. Things can go sideways in any major upgrade (hardware, OS, application, plugins, etc.)