Ok,thanks!!

is required to keep the two versions at once? I can not just keep the 3.4. as it opens my old hs3d? thanks

Ok,thanks,but I have to uninstall version 2.6 before? Thanks

On my Windows Xp I have installed a long time version 2.6 of Sweet Home, and it works perfectly.
If I upgrade to the latest 3.4 version, let me know if I have problems opening my (very important!) SH3D old files.
If you think I can safely upgrade version, I would like to know what the correct way ...