I can't install MacOSmohave
It says this copy of the install macOS Mojave application is damaged, and can't be used to install macOS
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Go to System Preferences → Date & Time, untick the box next to 'Set date ..... automatically' and change the year date to 2019. It's the first time I've seen Mojave misbehave like this but is a common fix for systems from 10.10 onwards to change the year to a date closer to when it was released.
Don't forget to change the Date & Time back after the install has finished otherwise your internet won't work properly.