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If you are unable to change the system variable path in Windows 10 as an administrator, follow these steps:

1. Open Registry Editor by pressing Win+R and typing regedit in the Run dialog box.

2. Navigate to Computer\HKEYLOCALMACHINE\SYSTEM\CurrentControlSet\Control\Session Manager\Environment.

3. Right-click on Path and select Modify.

4. In the Value data field, add the path that you want to include in the system variable path, separated by semicolons (;).

5. Click OK and close the registry editor.

6. Open a command prompt, type echo %PATH%, and press Enter. You should see the updated path.

7. Restart your computer for the changes to take effect.

Note: Changing the system variable path in this way may not work for all applications. Some might still require the path to be updated in the usual way through the System Properties dialog box.