Adobe Digital Editions works on Mac and PC.
Once installed make sure your Sony reader is plugged in while Adobe DE is running and authorise both the computer and Sony reader.
Once they are authorised when you purchase a PDF or EPUB ebook from any ebook store selling Adobe DRM ebooks they will appear in Adobe DE.
If your reader is plugged in when you make the purchase it will automatically be recognised by Adobe DE and you can drag it straight from Adode DE onto your Sony reader.
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