Mac OS X issue

Gatekeeper, was first introduced in OS X Mountain Lion, it's a Mac security feature which prevents the user from launching potentially harmful applications.

If you received an "Universal Media Server.app is damaged and can't be opened..." or "Universal Media Server can't be opened because it is from an unidentified developper" message at running time, it's just mean that the application is not "authorized" by Apple, not identified as safe.

You can disable it for all the applications, or more safely only for some. Here are the steps to follow:

Temporarily Bypass Gatekeeper

• To temporarily bypass Gatekeeper, right-click (or Control-click) on the app’s icon and select Open.
  You’ll still receive an alert message, but this time it’s only a warning. Clicking Open again will launch the app.

Disable Gatekeeper

• Open a Terminal windows and enter the following command, followed by your admin password when prompted:
  sudo spctl --master-disable
  The Gatekeeper settings can be found in System Preferences > Security & Privacy > General. The Gatekeeper options are located beneath “All apps downloaded from:”
  Click the padlock in the lower-left corner to enter your password and make changes, then select “Anywhere” from the list of Gatekeeper options. The security feature will no longer bug you about apps from unidentified developers.

Note: More detailed informations can be found here and there.
Users also succeed using any of these command line:
xattr -rc "/Applications/Universal Media Server.app"
or
xattr -rd com.apple.quarantine "/Applications/Universal Media Server.app"

Note 2: In case your settings do not get saved, permissions should be correctly set.
See: https://support.apple.com/en-us/HT203538

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