Hi Vaan,
One thing please confirm that before you down load EIM app from BlackBerry world from the work space browser, the DUT (device under test) is activated (of cause ) and with NO any version of EIM on it (i.e a previously pushed one from BES).
The expectation here is : the EIM should be able to downloaded from work space and should work.
If so please open a Jira for this.