Hello, I installed in Ubuntu Sweet home 3d Version 6.6a through Software catalog.

Then, under home folder, I created:

a folder called .eteks
a subfolder called sweethome3d
a subfolder called plugins

I donwloaded this plugin https://sourceforge.net/p/sweethome3d/plug-ins/39/ and copied the the.sh3p file in plugin folder.

I started sweet home 3D but it seems that nothing has changed and plugin is not activated. In fact I cannot find Tool menu in the upper bar. Can you please help me out? Thanks.