unable to find English language bundle


I just downloaded I7-6L38-OSX.dmg and installed the inform.app (dragging it into a local folder). When I start the app, create a test project and press compile, I got the error message

When I open the app from within the mounted .dmg, my project compiles fine. Any clue about this problem?
Same happens with I7-6L38-OSX-MAS.dmg, and with the onyx sample project