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1. Right-click the thumbnail of a PDF file, and then choose Properties.

   

2. In the file's Properties dialog box, click Change.

   

3. Do one of the following:

   1. If you have Acrobat DC or both Acrobat DC and Acrobat Reader 2020, choose Adobe Acrobat DC and click OK.

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   2. If you have only Acrobat Reader 2020, choose Adobe Acrobat Reader 2020 and click OK.

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4. In the Properties dialog box, click OK.

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Now, the PDF files open in Acrobat Reader DC 2020 or Acrobat DC.