macOS High Sierra to Mojave Install Fail

An Error occurred while preparing the installation. Try running this application again".

Thanks for sharing issue solved!

oh Thanks @mehwish for help!
I wondering on Google. I’m trying that way to solve the issue.

oh dear it was very bad xp for me when i was start to using MacOS, My 1st Mac Book Pro already Installed then i decided to move on Mojave, I think so that i need to reinstall the OS and all data will be loss, but i take a backup to external device and i started to download as following steps, Please follow

1. Sign in icloud before download Mojave (Important)
2. Then Download Mojave almost 5.9 GB File.
3. You Disk space should be free at least 12GB.
4. Install after Download without losing Data.
5. Enjoy!