Announcing Windows 10 Insider Preview Slow Build 16291 for PC Insider

I'm in the process of installing it in a Hyper-V VM upgraded from build 16278 (Microsofts all version DVD on the Insiders Advanced page). As soon as its installed I'm switching to the Fast\Active ring to get build 16296.0

I missed this slow ring upgrade, and went to install t and said no updates found.

I checked bit further, and I saw a windows.old folder which was odd as I always delete them. I checked setting as I was upgraded to 16291. I had left my laptop on and it auto/upgraded without any restart now message t obviously did it outside active hours.

As I am on Pro, I decided to enable feature to defer updates for up to 365 days (I was only going to do about 30 days until ACU comes out) but this option does not exist in Insider versions! Obvious in hindsight why of course. You can delay for 7 days though.