[Partial error handling changes] [Standardize IPC replies]

helpers.js

@@ -80,18 +80,18 @@ module.exports.downloadFile = (url, destination, progressCallback, completeCallb
 
       response.data.on('end', () => {
         stream.end(() => {
-          completeCallback(true);
+          completeCallback();
         });
       });
 
       response.data.on('error', (e) => {
         stream.end(() => {
-          completeCallback(false, e);
+          completeCallback(e);
         });
       });
     })
     .catch((e)=> {
-      completeCallback(false, e);
+      completeCallback(e);
     });
 };