I have a 501 installation erorr when trying to install on my mac

Why the duplicate posts?

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Hi! Error 501 means the installer hit a required file that's already in use by another application. Save your work, close the app or process named in the installer log (on a Mac, Activity Monitor works great for finding and quitting the stuck process), then click Retry in the installer.

Adobe's official steps for this error are here: https://helpx.adobe.com/download-install/apps/troubleshoot/error-codes-300-and-above/error501.html

Hope that gets After Effects installed! Let us know how it goes.