If closing processes doesn't work, there may be "leftover" files from a previous installation.
Error code "501" when trying to install adobe apps. | Community adobe error code 501
Residual data from a previous failed installation or corrupted installer files can block the new process. If closing processes doesn't work, there may be
Adobe Error Code 501 typically occurs during the installation or update of Creative Cloud apps when a required resource is currently being used by another process. The full error message often reads: . Common Causes of Error 501 Adobe Error Code 501 typically occurs during the
Antivirus software, VPNs, or specific system settings may interfere with the installer's ability to access required folders. How to Fix Adobe Error Code 501 1. Close Background Processes
The most direct fix is to end any tasks that might be locking the installer's resources.