Hi
I am about to migrate a installation from v3 to v4 and are reading through this post.
http://www.advancedcustomfields.com/resources/getting-started/migrating-from-v3-to-v4/
I am checking what custom field types the installation uses and there is one called user_field.
What i can se that add on is not updated and are reading your message at Github.
https://github.com/lewismcarey/User-Field-ACF-Add-on/issues/21
Have you got any response from the developers?
Hi @torbjorn_s
ACF v4 contains it’s own user field. Assuming the data is saved in the same way, there should be no issue upgrading.
The only thing you will have to do is uninstall the v3 User add-on and re-create the field as a native user field
