How to begin upgrading from 7.36.10?

I know this is an ugly one… I’m trying to upgrade an organization that is still on 7.36.10. What does the upgrade path even look like for an org this out of date? I tried jumping straight to 12.1.7 in a sandbox and got the following error. I imagine I probably need to upgrade in phases?

1.  You can't remove design attributes 'type,id,parameters,useURLParameters' when the component implements a Lightning Page interface. page: You can't remove design attributes 'type,id,parameters,useURLParameters' when the component implements a Lightning Page interface.

It seems the earliest package I can upgrade to from the releases archive is Rockaway Iteration 14 which results in the following error:

Static Resource named skuid__v1 does not exist. Check spelling.

Hi Charles, happy to hear that this org gets upgraded. Could you please let us know what kind of Salesforce Edition you use?