How to Upgrade your CDS instance for Project Roadmap

I'm stuck again as the CDS upgrade process is 100% user UNfriendly. 

1) If you have any flows that are associated with removed user accounts the Step 2 Resource copies screen is blank! I didn't grab a screen shot before I removed those orphans, but here is what it looked like in a nutshell. 

2) Now that I've fixed #1, I get a list of affected flows, but 

a) I have to email each user individually by selecting their hyperlink name

b) The email has an empty <a href>

Hello James Ruskin, You have an app <a href='link'>'Recurrence -> Create a task'</a> in CDS environment 'Questionmark Corporation (default)' pending upgrade. Thank you, Admin

c) When the user navigates to their My Flows page, there is no actual upgrade message or way to upgrade!! From one user 
"OK, I've now clicked just about every ellipsis I can find. The only mention of upgrading is when I try a new-and-unsupported type, and it doesn't tell me how / give me links, it just says I need to upgrade. This is also, unhelpfully, unrelated to my _current_ flow"