[SOLVED] This copy of the Install macOS High Sierra.app application is damaged…

Image Source: https://apple.stackexchange.com/questions/338008/i-cant-install-macos-mojave-because-this-copy-of-the-install-macos-mojave-app-a

Most common cause of this error is due to the invalid time in your mac. All you have to do is correct it then retry the installation.

Step 1: Check whether you have the same issue. Open the terminal.

Step 2: Check the date and time using the date command.

Wrong date and time!

Step 3: Update the date and time of your machine using the date command.

Format [mm][dd]HH]MM[yy]

Step 4: Quit terminal.

Step 5: Retry the installation.