Broderbund, the original publisher, was acquired and dissolved years ago. The rights to the software have passed through various hands (eventually landing with Encore Software and later being discontinued). There is no official website offering a digital download, let alone a free one. The servers that once authenticated the software are long offline.
This is the most critical section. Because this software is nearly two decades old, it is technically . The original publisher no longer sells or supports it. This creates a gray area. 3d home architect 4.0 free download
Because this is legacy software, you can find it hosted on digital preservation archives: the original publisher