Hi F.clayton,
Based on your post, I’d like to confirm the symptom you encountered. According to “The automatic updates still enabled”, do you mean after you set the registry key, Office 2013 ProPlus would still update to Office 2016 ProPlus automatically or there would
be some updates on Office 2013?
Furthermore, you said “We are trying to disable automatic updates for all the computers we have in our organization”. Do you mean you want to prevent automatic updates for Office 2013 ProPlus or prevent Office 2013 ProPlus from updating to Office 2016 ProPlus
automatically?
If your plan is Office 365 ProPlus, Office 365 Enterprise E3 or Office 365 Enterprise E4, updates to Office 2016 ProPlus from Office 2013 ProPlus won’t happen until February 2016. You can refer to this article for related information:
How do I get the new Office 2016 apps using Office 365 for business?
Any updates will be appreciated.
Regards,
Fraser