Run the install from the Symantec Download Manager Folder
1.Press the Windows + R keys to open the Run dialog box.
2.Type the following text, and then press Enter.
%temp%
3.The current user’s Temp folder opens in Windows Explorer.
4.Open the Symantec Download Manager folder.
5.Double-click the Install.exe file to start the installation.
6.Follow the on-screen instructions to complete the installation.