Hola Alejandra,
Are you saying some of the migrated datasets do show versions, while others don't? Or is it that all the migrated ones don't show versions?
Also, do you have an more info about that error message when editing? If you could include the server log from when you see this error, that would be helpul in debugging.
About the missing Author identifier schema and identifier fields, do you know if any changes were made to the database table for dyanic dataset field types? It might be helpful to see the result of the following query:
select * from datasetfieldtype;
Thanks,
Gustavo