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Type migration is not available the way the video describes it.
When we try to do Type Migration (Sept 2019) we see the following tooltip on top of <Song>
Only fields, variables, method parameters or methods of valid type can be considered.
Has anyone gone around it by other than manually updating the names?
Also, as others noted a class is missing from the download.
I think I got it working...
Press ⌃⇧F6 or on the main menu, select Refactor | Type Migration.
UPDATE: I got the 2nd use working by using "Rename" from the list of options under the main Refactor menu