How to export ALL photos from Mac Photos app

[iMore Question]

A friend is moving from Mac to Windows (!) and wants to be able to transfer the hundreds of photos now in the Mac Photos app to a form that's usable on her PC. I can show her how to select and export numbers of individual photos, but it would be incredibly tedious to use this method to export ALL of the photos. Is there some way to get at the photos in the Photos Library and simply copy them to a disk, hopefully as JPGs? The Mac they're stored on is a 2010 iMac running El Capitan and she wants to use them in Windows 7.

 

[Just_Me_D]

Is there not a select all option therein? It has been a while since I've turned on my MacBook running El Capitan, but I do recall having the ability to mass select the photos in the Photos app.