New Blog Templates selector not showing inside Gravity Forms

Hello

Here's an article to show the template selector in the registration page (made with Gravity Forms):

https://premium.wpmudev.org/project/new-blog-template/#usage

However, I don't see the option "Display Templates Selector" in the Gravity Forms options. I have the developer licence of GF (1.9.16), User registration Add-on (3.1) and New Blog Templates (2.8)

How can I activate the "Display Templates Selector" to show up in the registration screen, made with GF?

Regards

Christof