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Users can install LastPass as a browser plugin. Thus you can rely on client side scripting languages to check if LastPass is installed.

For instance, using NavigatorPlugins.plugins allows you to get the a PluginArray object, listing the plugins installed in the application:

function getLastPassVersion() {
  var lastpass = navigator.plugins['LastPass'];
  if (lastpass === undefined) {
    // LastPass is not present
    return undefined;
  }
  return lastpass.version;
}

Note also that what you are asking for is commonly implemented and used by browser fingerprinting technologies.