Go to Applications > Utilities to find Activity Monitor, and launch it by double-clicking its icon. (The Applications folder is on the root level of your hard drive.)
"Please close the following applications to continue: - SafariNotificati" error when installing Acrobat
Issue: Installation error message
When you install Acrobat Pro or Acrobat XI Pro from the Creative Cloud desktop application on Mac OS X 10.9 Mavericks, the following message appears: "Please close the following applications to continue: - SafariNotificati."

Acrobat Pro

Acrobat XI Pro
Solution
A conflicting application is blocking installation. Run the Activity Monitor to stop it.
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In the Activity Monitor, select the process with the full name SafariNotificationAgent, then click the upper-left button to close the process.
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