Adobe Creative Cloud installation failed with Error 191
Error code: 191
The Creative Cloud app could not be installed, often due to an underlying OS-level error (visible in the Install.log as an #@#OS_Error_Code). Common causes include access denial (0x80070005), incorrect Windows Advanced Storage Settings, or AppLocker/Group Policy restrictions blocking UWP package deployment.
An underlying Windows OS error (such as 0x80070005 Access Denied) is blocking the UWP package installation.
The default install drive in Windows Advanced Storage Settings is not set to the Windows system drive.
Group Policy or AppLocker rules are preventing installation of packaged apps.
Registry values under HKEY_LOCAL_MACHINE\Software\Policies\Microsoft\Windows\Appx are restricting app installation.
An outdated operating system is causing installation compatibility issues.
How to fix it
Open the Install.log file at C:\Program Files (x86)\Common Files\Adobe\Installers and find the value after #@#OS_Error_Code, then look up that code in Microsoft's common error codes documentation.
Go to Windows Settings > System > Storage > Advanced storage settings > Where new content is saved, and set all dropdowns to Windows (C:).
Check the registry at HKEY_LOCAL_MACHINE\Software\Policies\Microsoft\Windows\Appx and set any blocking keys (value of 1) to 0.
In Local Security Policy, review Application Control Policies > AppLocker > Packaged app Rules for rules blocking deployment.
Update Windows to the latest available version and retry the installation.
