I just bought a new imac 27" which came with High Sierra. I am trying to update to Mojave and I am having trouble. I go to the app store and download the mojave installer and that seems ok. Then when I run the mojave installer, it churns for a while and looks like its working. After several minutes, it fails and displays an error saying: "An error occurred validating the installer data. Te download is either damaged or incomplete. Redownload the installer ant try again." if i look at the file size of the mojave installer it is 6.03 GB which i think is correct. I have done this several times and its been the same result every time. With that said, I have noticed that when downloading files with chrome, most of the time, it will download most of the file and then say failed. if i click the item on the chrome downloads bar at the bottom of the screen and click resume, it will finis the the download without issue. I have tried connecting to my network using wifi and with ethernet, and I have had the same issue with both connections. Has anyone else had this issue or can anyone offer any insights on how to troubleshoot this?