"This copy of the Install macOS Mojave app is damaged"

[Drifty_Child]

I just received a refurbished MBP 2018 15" right out of the box from Apple, and immediately opened the app store to attempt to install Mojave. However, after the download completed, I clicked Open in the app store, and I get a window saying "This copy of the Install macOS Mojave application is damaged, and can't be used to install macOS."

...What?? This is *literally* the first thing I do upon turning on this computer for the first time ever. How can this have possibly gone wrong? How do I get Mojave on this thing?

 

[Absrnd]

You can try a reboot, and try again,
or try a fresh install, but there might be something wrong with the HD, I would take it back.

 

[Darth.Titan]

You got a bad download. It happens. That's what checksums are for. Delete the installer from your Applications folder and download again.

 

[Drifty_Child]

I tried redownloading it, and was able to open the installer. But now an error occurs whenever I try to install it. It simply says "An error occurred installing macOS". Then I can click "OK", and the installer closes.

 

[Crash0veride]

Make sure the date/time is right / updating? Seems unlikely on a new machine, but I've had that message installing on a mac powered off a while and the date wasn't updating.

 

[Drifty_Child]

The date and time are right. "November 21, 2018".

 

[fisherking]

call apple.