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This article explains how to set the default application for opening PDF files. PDF files are typically accessed by either Adobe Acrobat (Reader) DC or Adobe Acrobat (Pro) DC. System updates, the addition or removal of certain software packages (for example, going from Adobe Acrobat (Reader) DC to Adobe Acrobat (Pro) DC), or prompts from applications can cause the PDF file type to be associated with other applications.
Adobe Acrobat requires you to create a free Adobe account on their website. These are the credentials it is requesting.