More powerful than other PDF software, Adobe Acrobat Reader DC is the free, trusted standard for viewing, printing and annotating PDFs. And now, it’s connected to Adobe Document Cloud — so it’s easier than ever to work with PDFs on computers and mobile devices.
Upgrading to Acrobat Reader DC is free. See What's new in Acrobat Reader DC.
When you see a prompt to upgrade your Adobe Reader X or XI to Reader DC, you can follow the prompt to decide whether you want to upgrade to Reader DC or opt-out of the upgrade.
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When you open a document in Adobe Reader XI, an in-app prompt is displayed below the toolbar as shown in the screenshot below. Choose Opt-out from the Upgrade drop-down menu.
Alternatively, if you see the following toast notification for upgrading your Reader XI to Reader DC, click anywhere in the notification pop-up.