What to do if the installation package is damaged and cannot be opened in MacOS

 What to do if the installation package is damaged and cannot be opened? Can't open "XXX" because it comes from an unidentified developer. How to deal with it

Method 1. 

1.Open the terminal and enter

sudo spctl --master-disable

And password.

Method 2.

1. Open the terminal, paste the following command in the terminal: sudo xattr -r -d com.apple.quarantine and enter a space after the command (note: there is a space after the command).

2. Drag and drop the damaged software from the application program to the back of the command, press Enter, enter the power-on password, the password will not be displayed, press Enter to get it done, and other software can also operate in the same way.

Further more, if it's not working, try to use sudo -i to get in the root account.(The password will not be displayed, press Enter to get it done)