As it happens, I own multiple copies of Kentucky Route Zero from GOG, Steam and Humble Bundle. It turns out that Steam and Humble Bundle currently offer v11 while GOG has v10. Since I believe GOG easily offers the best overall KRZ package, I emailed the developer about the discrepancy today.They responded within minutes and said they would ensure that GOG had the v11 update.

I love this game and I love GOG. A better outcome could not be had!