neowin[.]net/news/microsoft-releases-windows-10-version-21h1-isos-to-insiders/
microsoft[.]com/en-us/software-download/windowsinsiderpreviewiso
This might be handy if you need to (re)install Win10, as it should have most of the latest patches/updates included. While technically a beta version of this spring's Win10 update, the changes are so minor that there's almost no chance of problems -- it's just the latest regular version of Win10 with a couple few updates already applied.
It does require signing in with a Microsoft account enrolled in the Insider program to download, but enrolling or signing up for the Insider program is just a matter of signing in with your account and checking a box or two.