Quick Summary
Error 8002 on macOS generally indicates a problem with the installation package or the system's ability to verify it. This can prevent you from installing or updating applications, potentially due to corrupted files or permission issues.
Common Causes
- Corrupted Downloaded File: The installation package itself may be incomplete or corrupted during the download process, leading to verification failure.
- Insufficient Permissions: Your user account might not have the necessary permissions to write to the installation directory or modify system files, preventing the installation.
- Disk Space Issues: Lack of sufficient free space on the target drive can interrupt the installation process and result in errors.
- Gatekeeper Security Settings: macOS Gatekeeper settings may be configured to block the installation of apps from unidentified developers. Newer installers are frequently blocked.
- Conflicting Software or Processes: Other applications or background processes interfering with the installation process and causing conflicts.
Step-by-Step Fixes
Method 1: Redownload the Installation File
Step 1: Delete the existing installation file.
Step 2: Visit the official website of the application you're trying to install.
Step 3: Download a fresh copy of the installation package.
Step 4: Try running the installer again.
Method 2: Verify Disk Space
Step 1: Open the Apple menu and select 'About This Mac'.
Step 2: Click on the 'Storage' tab.
Step 3: Ensure that you have sufficient free space on your startup disk.
Step 4: If necessary, delete unnecessary files or move them to an external drive.
Method 3: Adjust Gatekeeper Settings
Step 1: From the Apple menu, choose System Settings.
Step 2: Click Privacy & Security in the sidebar.
Step 3: Scroll down to the Security section.
Step 4: If the app you’re trying to open is listed under “[App name] was blocked from use because it is not from an identified developer”, click Open Anyway to confirm your intent to open or install the app.
Step 5: If the app is not listed, set 'Allow applications downloaded from:' to either 'App Store' or 'App Store and identified developers'. Attempt installing the application. If the problem persists, temporarily select 'Anywhere' and try again (Note: this lowers your computer's security.)
Step 6: After installation, revert the setting back to a more secure option (App Store or App Store and identified developers).
Method 4: Run Disk Utility
Step 1: Open Disk Utility (Applications/Utilities).
Step 2: Select your startup disk in the sidebar.
Step 3: Click 'First Aid' and then 'Run' to repair any disk errors.
Method 5: Run the installer with Administrator Privileges
Step 1: Locate the installer file.
Step 2: Right-click on the installer file and select 'Open'.
Step 3: If prompted, enter your administrator password to proceed with the installation.