Print the exact path get_file.js is trying to write to when failing.

bootstrap/win/get_file.js

 // Copyright (c) 2009 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 function Download(url, path, verbose) {
   if (verbose) {
     WScript.StdOut.Write(" *  GET " + url + "...");
   }
   try {
     xml_http = new ActiveXObject("MSXML2.ServerXMLHTTP");
   } catch (e) {
-    WScript.StdOut.WriteLine("[-] XMLHTTP " + new Number(e.number).toHex() + 
+    WScript.StdOut.WriteLine("[-] XMLHTTP " + new Number(e.number).toHex() +
         ": Cannot create Active-X object (" + e.description) + ").";
     WScript.Quit(1);
   }
   try {
     xml_http.open("GET", url, false);
   } catch (e) {
-    WScript.StdOut.WriteLine("[-] XMLHTTP " + new Number(e.number).toHex() + 
+    WScript.StdOut.WriteLine("[-] XMLHTTP " + new Number(e.number).toHex() +
         ": invalid URL.");
     WScript.Quit(1);
   }
 
   var response_body = null;
   var size_description = "?";
   var file_size;
   try {
     xml_http.send(null);
     if (xml_http.status != 200) {
-      WScript.StdOut.WriteLine("[-] HTTP " + xml_http.status + " " + 
+      WScript.StdOut.WriteLine("[-] HTTP " + xml_http.status + " " +
           xml_http.statusText);
       WScript.Quit(1);
     }
     response_body = xml_http.responseBody;
     size_description = xml_http.getResponseHeader("Content-Length");
     if (size_description != "") {
       file_size = parseInt(size_description)
       size_description = file_size.toBytes();
     } else {
       try {
         file_size = new Number(xml_http.responseText.length)
         size_description = file_size.toBytes();
       } catch(e) {
         size_description = "unknown size";
       }
     }
   } catch (e) {
-    WScript.StdOut.WriteLine("[-] XMLHTTP " + new Number(e.number).toHex() + 
+    WScript.StdOut.WriteLine("[-] XMLHTTP " + new Number(e.number).toHex() +
         ": Cannot make HTTP request (" + e.description) + ")";
     WScript.Quit(1);
   }
 
   if (verbose) {
     WScript.StdOut.WriteLine("ok (" + size_description + ").");
     WScript.StdOut.Write(" *  Save " + path + "...");
   }
 
   try {
     var adodb_stream = new ActiveXObject("ADODB.Stream");
     adodb_stream.Mode = 3; // ReadWrite
     adodb_stream.Type = 1; // 1= Binary
     adodb_stream.Open(); // Open the stream
     adodb_stream.Write(response_body); // Write the data
     adodb_stream.SaveToFile(path, 2); // Save to our destination
     adodb_stream.Close();
   } catch(e) {
-    WScript.StdOut.WriteLine("[-] ADODB.Stream " + new Number(
-        e.number).toHex() + ": Cannot save file (" + e.description + ")");
+    WScript.StdOut.WriteLine(
+        "[-] ADODB.Stream " + new Number(e.number).toHex() +
+        ": Cannot save file to " + path + ": " + e.description);
     WScript.Quit(1);
   }
   if (typeof(file_size) != undefined) {
     var file_system_object = WScript.CreateObject("Scripting.FileSystemObject")
     var file = file_system_object.GetFile(path)
     if (file.Size < file_size) {
       WScript.StdOut.WriteLine("[-] File only partially downloaded.");
       WScript.Quit(1);
     }
   }
   if (verbose) {
     WScript.StdOut.WriteLine("ok.");
   }
 }
 
 // Utilities
 Number.prototype.isInt = function NumberIsInt() {
-  return this % 1 == 0; 
+  return this % 1 == 0;
 };
 Number.prototype.toBytes = function NumberToBytes() {
   // Returns a "pretty" string representation of a number of bytes:
   var units = ["KB", "MB", "GB", "TB", "PB", "EB", "ZB", "YB"];
   var unit = "bytes";
-  var limit = 1; 
+  var limit = 1;
   while(this > limit * 1100 && units.length > 0) {
     limit *= 1024;
     unit = units.shift();
   }
   return (Math.round(this * 100 / limit) / 100).toString() + " " + unit;
 };
 Number.prototype.toHex = function NumberToHex(length) {
   if (arguments.length == 0) length = 1;
   if (typeof(length) != "number" && !(length instanceof Number)) {
-    throw Exception("Length must be a positive integer larger than 0.", 
+    throw Exception("Length must be a positive integer larger than 0.",
         TypeError, 0);
   }
   if (length < 1 || !length.isInt()) {
-    throw Exception("Length must be a positive integer larger than 0.", 
+    throw Exception("Length must be a positive integer larger than 0.",
         "RangeError", 0);
   }
   var result = (this + (this < 0 ? 0x100000000 : 0)).toString(16);
   while (result.length < length) result = "0" + result;
   return result;
 };
 
 if (WScript.Arguments.length != 2) {
   WScript.StdOut.Write("Incorrect arguments to get_file.js")
 } else {
   Download(WScript.Arguments(0), WScript.Arguments(1), false);
 }