New
#1
First failure to upgrade on any of my computers.
I have been on the Win 10 fast track with four computers since the start. All upgrades have been successful until 10240 fails to upgrade on my Lenovo Yoga 2 laptop. It gets to about 19 percent and then reverts back to build 10166. I noticed a safe mode indication during the upgrade and I don't know if that is significant. Two of my computers have been successfully upgraded to 10240. I haven't tried 240 on my other Lenovo laptop yet.