After purchasing ESU key and activating it，reboot and try.
If the connection issue still exists，please take below two methods.
Method A）
Try reset windows update components
Open a command prompt with Administrative Privileges, run the following:
After purchasing ESU key and activating it，reboot and try.
If the connection issue still exists，please take below two methods.
Method A）
Try reset windows update components
Open a command prompt with Administrative Privileges, run the following: