Error Code 501 occurs during the installation or update of Creative Cloud apps when the installer is unable to modify a required file because it is currently in use by another application or background process Adobe Help Center Quick Fix (Task Manager/Activity Monitor)
In 95% of cases, the solutions above—specifically running the and temporarily disabling antivirus —will resolve the issue. For the remaining 5%, a complete system reboot of Adobe’s licensing infrastructure (Solution 5) is required. adobe error code 501