Install successfully according to the following operations:

1. Press the key combination win+R to start the operation, enter cmd and press enter, then enter net stop wuauserv and press enter to stop updating the service;

2. Open the "Windows" folder under the root directory of drive C, find the SoftwareDistribution folder and rename it SDold.

3. Press the key combination win+R to start running, enter cmd enter, and then enter net start wuauserv enter to start the update service;

4. It is being installed. Net framework 4.0 will now succeed.