In order to make “Freeze Track” work with latest Renoise version 3.1.1, some adjustments needed to be made in the code. A couple of years ago (in 2014) i updated the “Freeze Track” script for Renoise to be working with newer versions and sent a copy to the original author. Unfortunately the author never uploaded the updated version to the renoise.com scripting tool page and the renoise team didn’t accept my submission because i am not the original author.
The following version is working with latest Renoise 3.1.1:
https://blog.b-nm.at/2019/08/17/freeze-track-script-for-renoise-3-1-1/