You can download PSE 7, 8 (windows only), 9, 10, and 11 here:
https://helpx.adobe.com/download-install.html
You will need your serial number to license the download. If you registered PSE with Adobe, you can go to
http://adobe.com
and look for My Adobe or where it says, "Welcome, < your name >", and work your way through the links to your user account/purchases and you should see it there.
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