Simple Adobe Illustrator Panel to generate placeholder image content from Flickr or Unsplash

Adobe doesn't make this very straightforward, and I've never had much success packaging and signing extensions.

Download

Win: C:\Program Files (x86)\Common Files\Adobe\CEP\extensions
Mac: /Library/Application Support/Adobe/CEP/extensions

or

Win: C:\<username>\AppData\Roaming\Adobe\CEP\extensions
Mac: ~/Library/Application Support/Adobe/CEP/extensions

you may have to create folder if it doesn't already exist

Win: regedit > HKEY_CURRENT_USER/Software/Adobe/CSXS.7,
then add a new entry PlayerDebugMode of type "string" with the value of "1".

Mac: In the terminal, type: defaults write com.adobe.CSXS.7 PlayerDebugMode 1
(The plist is also located at /Users/USERNAME/Library/Preferences/com.adobe.CSXS.7.plist)

May require restart or log-out/in

More info here: Adobe CEP Cookbok Repo