Adobe Creative Cloud installation failed with Error 21
Error code: 21
The device does not meet the minimum system requirements for the Adobe app being installed, or Windows Compatibility Mode is enabled on the installer, preventing it from running correctly.
The device's operating system version does not meet the minimum requirements for the Adobe app.
Windows Compatibility Mode (WCM) is enabled on the installer's Setup.exe, causing the installer to simulate an older environment.
Insufficient hardware (RAM, CPU, disk space) to meet the app's system requirements.
How to fix it
Locate the Setup.exe installer file, right-click it and select Properties, go to the Compatibility tab, and uncheck 'Run this program in compatibility mode for', then click Apply.
Verify that your device meets the minimum system requirements for the Adobe app you are trying to install.
Update your operating system to a supported version if it is out of date.
If requirements are met, try reinstalling the Creative Cloud desktop app and retrying the installation.
