There is nothing to worry about since the solutions are easy to implement. However, the most common cause of this is an expired certificate. This may be the result of a number of factors, including problems with the network or the disk, or infections caused by malicious software. If you received this error, it indicates that the file for the installation that you got from the App Store or another source is either damaged or missing some required components. What Does This Mean: This Copy of the Install macOS Application is Damaged and Can’t Be Used to Install macOS? But I got your back! Follow along to find out what this error means and how you can fix it. It can be frustrating and confusing, especially if you downloaded the installer from the official Apple website or App Store. If anyone has updated from High Sierra to Mojave and can provide guidance, that would be great.While attempting to install a new version of macOS on your Mac, you may see an error notice stating This copy of the install macOS application is damaged. Since I want all applicable updates available installed and do not want to make assumptions about what may or may not need to be manually installed, I have a case # and will call Apple for guidance instead of assuming anything and making a mess of my system. I realize this is probably very basic stuff for advanced users, but when it comes to my OS installs and updates, I am opting for the safe route since some of my installed updates only installed necessary components for High Sierra and I will need to only upgrade and add anything pertinent for Mojave. Presuming these are the same updates I already installed for High Sierra applicable for OSX Mojave, I thought it was odd that the version shown as installed currently (about this Mac is 10.14 base). Update, My system updates is suggesting I go straight to Catalina, so I disabled automatic OS updates (will wait a while until the bugs are worked out), I did see in small print within the update area "another update is available" and it is 10.14.5 (skipping other released updates available for download and installation for Mojave). This is going to be an extremely tedious process. I did find the individual updates, and am in the process of downloading them to a specific folder on my iMac and will need to install them in the order they were rolled out. Also note, I am having to manually find each update for Mojave that came out since the software update function is only telling coming up with Catalina and not providing me with the intermittent updates that were rolled out along the way for Mojave. **** Important - There were major changes in High Sierra. I highly recommend reading through the documentation listed regarding compatibility first, follow the instructions (read what OSX you should have installed prior to updated to Mojave). The upgrade link to Mojave in the Ap store that is purposefully placed toward the end of the page so users will read the information Apple needs us to read for a good install. This is how I found and dowloaded the base version of Mojave 10.14 and had no issues with the download and install over High Sierra (latest fully updated version). Page link for help on Apple to find Mojave download in the App Store (also has detailed information regarding what you need to have prior to installing.
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