I would suggest to use "supprimer" rather than "ôter" which I never saw in a program.
Et en installant la version 32 bit?
Level Tags Manager plugin
By the way, the paid Microsoft pop up isn't a bug.
Try the free version available at https://sourceforge.net/projects/sweethome3d/files/SweetHome3D/SweetHome3D-7.5/SweetHome3D-7.5-windows.exe/download and if it still doesn´t work, describe your problem.
Run the installer again and select 64 bit architecture when prompted, if you didn´t do it the first time.
You should try with a JDK which still provides JApplet, AccessControlException, and other deprecated APIs.
2D textures duplicated on virtually all furniture items upon file load