The error of invalid signature is caused by trying to install the main index of "unofficial" application, that is, the damaged application, which can be solved by changing the download source and downloading again. The detailed steps are as follows:

1, click on the lower left corner to find the setting icon.

2. Open the settings and enter the settings page.

3. Enter "Privacy".

4. Turn off the SmartScreen filter as a whole.

5. Open the folder of recently downloaded programs.

6. After opening the folder, try to double-click the downloaded program and run it. At this point, the system will prompt "This program may cause security risks to the computer" and click "More Information".

7. If the open program is shown as "Unknown Publisher" as shown in the figure below, there are two possibilities. One is that the publisher is not filled in for the application at all, and the other is that the system cannot read the publisher information due to the network speed.

8. It can be solved by downloading again from another download source.