Here is the terminal response:

--------------
You have mail.
/Applications/Sweet\ Home\ 3D.app/Contents/MacOS/SweetHome3D ; exit;
XXXXXXXX ~ % /Applications/Sweet\ Home\ 3D.app/Contents/MacOS/SweetHome3D ; exit;
Exception in thread "main" java.lang.NullPointerException
at sun.lwawt.macosx ...

Correct, i wrote the wrong Version its 6.5.5

Hello,

i just got the Mac OS X Version 6.6.5 from MacApp Store.

My System:
- Big Sur (11.4)
- MacBook Pro 15 Zoll 2016
- 2,7 GHz Quad Core i7
- 16 RAM

Cannt get Sweet Home to start. If i start the Programm it start shortly 1-4 Seconds and than it close it.

Thanks for support.

Best Chris