While the search for a free download is understandable, if you are serious about architectural visualization in Blender 2.8, the Pro version is arguably worth the investment. Here is why:
If you cannot find a working version of the legacy free Archipack, or if you simply prefer open-source archipack blender 2.8 free download
It uses a "manipulate mode" that allows you to drag handles directly in the 3D viewport to resize objects accurately. While the search for a free download is
Blender 2.80 and subsequent versions like 2.81 actually include a free version of Archipack (version 1.2.8x) pre-installed. blender-addons.org How to Activate Edit > Preferences > Addons , select the tab, and search for "Archipack". select the tab