Well, it wasn't pretty...
Repeating the upgrade with a non-trivial site crashed and burned. Several times. The site is a multi-portal site with a dozen or so portals, a half-dozen different portal skins, Active Forums, and a few other non-standard modules. The base site has been around and upgraded over the past 6 years from DNN3 or 4 to the current 7.0.6. The error(s) caused the upgrade to hang around 25% through, leaving me in la-la land.
What kinda worked was to take the 'virgin' 7.0.6 site, successfully upgrade to 7.3.4, then add in all of my upgraded modules and skins. I then exported each portal w/content from the old site and imported to the new site. Active Forums got trashed, Links did not make the journey and users need to re-register. But it 'mostly' worked and I learned a lot... I'm trying to decide whether to try the upgrade again or live with/rebuild what I have and get on with my retirement... :(
I do have one site, a single-portal local government site with many users and many pages, but one skin [not compatible] and not much unusual stuff. It is now at 6.0.1 because of the skin incompatibility with 7. I may try converting it next. I'm actually thinking about first moving it to new hosting, first... :) AppliedI is running a $49/yr special.
I do love DNN, though. At least today. Again.
Bob H.