If you are a corporate administrator, to enable your users to install the custom package from a network server, you must either lower the level of your intranet security or specify your network servers as trusted sites. To do the latter, do the following:

To specify your network servers as trusted sites
  1. In Windows® Internet Explorer®, click Tools, and then click Internet Options.

  2. Click the Security tab, click Local intranet, and then click Sites.

  3. Clear the Include all network paths (UNC) check box, and then click OK.

  4. Select the Trusted sites zone, click Sites, type the path for the download server, and then click Add.

  5. Repeat the previous step for every download server that you want to specify as trusted.

Additional references