If you install the game from the gog version and the location the game is
installed in does not end as follows the Leveleditor will not work correctly.
EF2/base/

Not working:
A:\Games\GOG\Star Trek Eite Force II\base\

Working:
A:\Games\GOG\Star Trek EF2\base\

The Leveleditor and Game SDK can be downloaded on ModDB.com
https://www.moddb.com