From LIB of December, 2017, the migration log file (mpupdlog.log) is no longer created in the System folder, but in the database (except for bases exclusively without base, such as PDV, for instance).
Thus, for log to be viewed, use UPDVIEWLOG function, calling it through Initial Program in the Smartclient:


When opening function, a window of Updating log is opened, listing errors detected in the migration:


On this screen, use functionality Print browse to generated an error report, or create Filter to list only certain types of notification:


To use a filter, click button Filter, then select which filters you want to apply to the table, and click Apply selected filter.