For some reason your blender does not report the true version. Is it a beta / instable one ? You may try to open the script console and enter bpy.app.version in order to confirm, should be (4.1.x) ...

I cannot install Archipack v2.8.1 on Blender 4.3.2. I have tried lower versions up to 3.5.1 but could not install it, after dragging and dropping the zip file into the user interface nothing appears ...