Right-click the taskbar, and select Task Manager.
Last updated on
Jul 30, 2025
Learn how to resolve error code 87 "Another installer is already running" during Adobe Creative Cloud installation.
Error 87 occurs when background processes, especially Microsoft Installer (MSI) processes or leftover files and folders, interfere with the installation. Insufficient permissions can trigger this error in some cases.
Solution
Wait for the current installation to complete, and then try to install the app again. If the issue persists, quit the current installation by following these steps:
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Look for any MSI installer processes that may be running.
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Right-click the process and select End Task.
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Once the conflicting process is closed, try to install the app again.
