[Steven Zahm]

@ karin

re: the tables the new connections uses are different from the old one. I altered one to at least import the data. that worked.
YOu say you altered one table … why not alter all the table names to match the new prefix? That sounds like it would fix the issue.

re: does your “old” version work with latest php version?
Yes.

re: Then I might try again and import just the connection data.
I suggest doing an export from the source DB of only the Connections db tables. Make sure you select every one of them. Do not miss any.

Drop the existing tables in the destination db and then do the image.

Then, if needed, make sure the imported table prefix is changed to match the new WP table prefix in the destination db.

Hope that helps!