Indeed the MySQLClient is missing.
After discussions with UiPath support, a workaround is to use a configuration in ‘ODBC Data Source Administrator’ (install it if you don’t have it).
Under System DSN, you need to click 'Add…:
Choose MySQL … ANSI:
Fill correctly the information and click ‘Test’, it should make a connection:
If the connection is successfully made, click Ok and return in UiPath.
Open the wizard and you should see under ODBC data source the Data source name you created
does this help?