The summary covers this.
This no longer applies. The mod has been updated and will function with warband version 1.153. The new version does not only port the mod, but also fixes several issues and improves overall performance. For a full changelog check this link: Forums.taleworlds.com
Awwww crap! is there any way to get a prepatch version?
Blased steam!
You can get the old warband version with your steam game key (dont share it) from here: Download.taleworlds.com
Specifically you can download any version from that link (changing the version number), but you will need your steam key to unlock it.
The module system is out for 1.151, but the large number of changes, requires quite a bit of work to make the mod compatible. We will do our best, but it will take time to port, update and fix things.