Regedit

To disable Windows Update in the other Windows 10 editions, you have to set NoAutoUpdate to 1 in
HKEY_LOCAL_MACHINE\SOFTWARE\Policies\Microsoft\Windows\WindowsUpdate\AU.

Windows Registry Editor Version 5.00

[HKEY_LOCAL_MACHINE\SOFTWARE\Policies\Microsoft\Windows\WindowsUpdate]
[HKEY_LOCAL_MACHINE\SOFTWARE\Policies\Microsoft\Windows\WindowsUpdate\AU]
"NoAutoUpdate"=dword:00000001

Name the new key AU and press Enter.
Inside the newly created key, right-click on the right side, select New, and click on DWORD (32-bit) Value.

Name the new key AUOptions and press Enter.
Double-click the newly created key and change its value using one of the following options:

2 - "Notify for download and notify for install."
3 - "Auto download and notify for install."
4 - "Auto download and schedule the install."
5 - "Allow local admin to choose settings."

Windows Registry Editor Version 5.00

[HKEY_LOCAL_MACHINE\SOFTWARE\Policies\Microsoft\Windows\WindowsUpdate\AU]
"NoAutoRebootWithLoggedOnUsers"=dword:00000000
"NoAutoUpdate"=dword:00000001
"AUOptions"=dword:00000002

http://www.tenforums.com/tutorials/8013-windows-update-automatic-updates-enable-disable-windows-10-a.html

To Enable or Disable Automatic Updates using Group Policy

   Note

This option is not available and will not work in Windows 10 Home. Microsoft has prevented disabling automatic updates in the Home edition.
This option will only work in the Windows 10 Pro and Enterprise editions.
This option does the same as Option Two below.

1. Open the Local Group Policy Editor.
2. In the left pane of Local Group Policy Editor, navigate to the location below. (see screenshot below)

Computer Configuration/Administrative Templates/Windows Components/Windows Update

3. In the right pane of Windows Update in Local Group Policy Editor, double click/tap on the Configure Windows Updates policy to edit it. (see screenshot above)
4. Do step 5 (enable), step 6 (Notify), or step 7 (Never notify) below for what you would like to do.

5. To Enable Automatic Updates
NOTE: This is the default setting.

A) Select (dot) Not Configured at the top, click/tap on OK, and go to step 8 below. (see screenshot below)

6. To Set Windows Update to Notify before Downloading and Installing any Updates

   Note

Recommended.
A) Select (dot) Enabled at the top. (see screenshot below)
B) Select 2. Notify for download and notify for install in the "Configure automatic updating" drop down menu under Options, click/tap on OK, and go to step 8 below.

7. To Set Windows Update to Never Notify or Check for Updates

A) Select (dot) Disabled at the top, click/tap on OK, and go to step 8 below. (see screenshot below)

8. When finished, close the Local Group Policy Editor.
9. Click/tap on the Check for updates button in Windows Update to apply.
10. Sometimes it may take a while for it to kick in to not automatically download and install updates though.

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Microsoft has made a tool available that allows all Windows 10 users to "hide" specific updates from the updating mechanism.
It's downloadable from here: https://support.microsoft.com/en-us/kb/3073930