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"An error occurred while preparing the installation. Try running this application again." This is the message I get after I download Mojave and click the "Restart" button. I even did a safe mode boot and reinstalled my current OS 10.13.6. I've tried it on wifi, plugged in internet, restarted the computer, hard reset the computer, at work, at home. Nothing works. I have a 2017 MacBook Pro with plenty of hard drive space.
Try delete installer from Applications folder and redownload from AppStore again. It’s worked for me. Sorry for bad English.
This is what I did and it worked. Thanks for the reply.
Error message during Mojave install
