• Make sure you have the most recent version of Adobe Reader DC installed, then check for any pending Adobe Reader DC updates via help>check for updates. After updating Adobe Reader, restart the machine.
• When downloading Acrobat Reader, you could run into certain problems. This usually happens for one of the following reasons:
• Your machine is not connected to the Internet, or your Internet settings are incorrect.
• It's time to update your antivirus software.
• It's possible that you're not connected to the Adobe server.

Read More: Why do we need Adobe Acrobat when every modern office program can save in PDF format?