A common support question is…
I’m trying to install my wordpress plugin addons zip file but when I download the file I end up with a php file instead of the zip file.
WordPress Support User from Support Tickets
It relates to your Safari browser settings and the fix is easy.
Safari will automatically uncompress any type of archive file, zip, rar, gz, etc. Instead of the compressed file you end up with the contents of the archive.
How to Fix Safari
Open Safari and in the menu bar click Preferences.
Select the “General” tab and uncheck “Open ‘safe’ files after downloading”