The easiest way to resolve the “This copy of the Install macOS . app application is damaged, and can’t be used to install macOS.” is to re-download the installer again from Apple, which contains a new fresh certificate that is not expired.
How do I fix my High Sierra install?
To fix the macOS High Sierra problem where the installation fails due to low disk space, restart your Mac and press CTL + R while it’s booting to enter the Recover menu. Select ‘Disk boot’ to boot normally, then remove any files you no longer need.
How do I fix macOS Sierra or later damaged App message?
How to Fix App Damaged and Can’t Be Opened Errors on Mac
- 1: Re-download the App. …
- 2: Reboot. …
- 3: Install Available System Software Updates. …
- 4: Use xattr on the App Throwing the Damaged Error.
How do I uninstall a damaged Mac installer?
2 Answers
- Go to your applications folder.
- Find the installer for macOS Mojave.
- Right click on the installer and click “Show Package Contents”.
- Click on folder named “Contents”.
- Click on the folder named “SharedSupport”.
- Delete the file named “InstallInfo. …
- Enter your administer password to confirm.
Why is my macOS Sierra not installing?
macOS Sierra problems: Not enough space to install
If you get an error message while installing macOS Sierra saying that you don’t have enough hard drive space, then restart your Mac and boot into safe mode. … Then restart your Mac and try to install macOS Sierra again.
How do I reinstall OSX High Sierra from USB?
Create a bootable macOS installer
- Download macOS High Sierra from the App Store. …
- When it’s finished, the installer will launch. …
- Plug in the USB stick and launch Disk Utilities. …
- Click the Erase tab and make sure Mac OS Extended (Journaled) is selected in the format tab.
- Give the USB stick a name, then click Erase.
Why is my macOS damaged?
The cause of this error is an expired certificate, and because the certificate is expired, the “Install macOS” app for Mojave, Sierra, and High Sierra will not run. Fortunately, there is a fairly simple solution to the “damaged” installer problem. Below are the download links for the recent versions of macOS.
Why can’t I download Mac Mojave?
If you’re still having problems downloading macOS Mojave, try to find the partially-downloaded macOS 10.14 files and a file named ‘Install macOS 10.14’ on your hard drive. Delete them, then reboot your Mac and try to download macOS Mojave again. … You may be able to restart the download from there.
How do I download an older version of OSX?
Open the Mac App Store (choose Store > Sign In if you need to log in). Click Purchased. Scroll down to find the copy of OS X or macOS you want. Click Install.
Why do I not have permission to access file Mac?
If you don’t have permission to open a file or folder, you may be able to change the permissions settings. On your Mac, select the item, then choose File > Get Info, or press Command-I. Click the arrow next to Sharing & Permissions to expand the section. … Change the permissions to either Read & Write or “Read only.”
How do I repair a corrupted file on a Mac?
Mac’s Built-In Repair Shop
Open up your Applications folder, and click “Utilities.” Open up the Disk Utility application in that list to have access to the repair tool. Now simply drag your damaged DMG file onto the Disk Utility window. Click the damaged file, and then select “Repair Disk” in the First Aid tab.
How do I allow apps anywhere on my Mac?
Go to System Preferences > Security & Privacy > General. At the bottom of the window, you’ll see multiple options under Allow apps to be downloaded from. Select Anywhere to allow your Mac to download any and all apps.