trying to update to Mojave Opened link says it damaged

Find the "Install macOS Mojave" file in your Applications folder.

Delete the file and empty the trash.

Use this link to Get macOS Mojave from the App Store and try your upgrade again with the fresh download.

Also see:

How to upgrade to macOS Mojave - Apple Support

Grandmamo7 wrote:

Tryin go update Mac air to Mojave. Opened link Says its damaged

Delete it, empty your trash.

The main cause for a damaged/corrupt download is a slow or spotty Network download speed.

You can test—https://testmy.net/legit-speed-test.php

If in doubt get on a faster Network

Recommended settings for Wi-Fi routers and access points

If your Mac doesn't connect to the Internet over Wi-Fi - Apple ...

You might consider making a USBinstaller after you successfully download the full installer.

How to create a bootable installer for macOS - Apple Support

If it launches automatically, Quit like an other application, and it will be sitting in your Applications folder: "Install macOS Mojave.app"

Follow the advice given but also connect your mac to your router via cable rather than WiFi.

As it is an Air you will need either a USB to Ethernet cable or Thunderbolt to Ethernet cable.

When the mac is downloading do not use it for anything else, and if other devices use the

same internet connection don't se them either.

The installer was likely corrupted during download.

Go to the Applications folder, locate the Mojave Installer app, delete it, then try downloading again from Mac App Store.