Win10 preview version 9860 can not close the automatic upgrade how is it?

The preview version of the update is mandatory and cannot be closed. You can prevent system forcing updates by modifying the system files.
Enter pe (or you have dual system, switch to other systems), enter the drive letter of win10 (here, take C drive as an example), the following directory
C:/Windows/SoftwareDistribution/
Rename the Download folder in the folder, just start a name, do not download it, then create a new text document, named Download, and delete the suffix (.txt), making it a simple file Download
restart, Enter win10, it will not be updated automatically.