Who moved my cheese? Or in this case, who moved the option to delete previous versions of Windows on Redstone 5 Build 17661? Well it is still in the operating system but it has been moved to a new location.
I hope everyone had a chance to heed the warning about the closing of the Windows 10 magic window. Yesterday, with the release of Windows 10 RS5 Build 17661, Microsoft merged both the Skip Ahead and Fast rings. That means the same build will now be pushed into those two rings when updated testing builds are released.