no!
you can just download the edited warband exe copy it in your warband folder and play.
just don'T forget to make a backup of the original for later.
So basically the options for steam users are
1. Revert back to 1.134 version (or whatever version it is)
2. Delete the old warband folder and reinstall it (or dowload patch for warband?)
3. Or wait for someone like Steam or someone to do something about it