2. In the opened local group policy editor window, find: User Configuration-Management Template; In the management template expansion item, find: System, expand; In the expanded item of the system, find: driver installation, and left click: driver installation; In the right window corresponding to driver installation, find: code signing of device driver, and left click: code signing of device driver;

3. In the opened device driver code signing window, select Enabled, and there are Warning, Blocking and Ignore in the option drop-down box.

Warning: Notify users of files that are not digitally signed, and let users decide whether to stop or continue the installation, and whether to allow the installation of files that are not digitally signed.

Block: Indicates that the system refuses to install files that are not digitally signed.

Ignore: Command the system to continue the installation (including installing files that are not digitally signed).

If you want to install a driver file without digital signature, you can choose: Ignore, and then click: OK; After installing the driver of Mastercam X5, it is recommended to set the item just set to ignore as warning (default setting) to enhance the security of the system.