diff --git a/downloader.py b/downloader.py
index e4fcfdd..6fe2db7 100644
--- a/downloader.py
+++ b/downloader.py
@@ -117,13 +117,12 @@ def doDownload(manifest):
 
     sess = requests.session()
 
-    i = 1
     iLen = len(manifestJson['files'])
 
     print("%d files to download" % (iLen))
     programGui.setOutput("%d files to download" % (iLen))
 
-    for dependency in manifestJson['files']:
+    for i, dependency in enumerate(manifestJson['files'], start=1):
         depCacheDir = cache_path / str(dependency['projectID']) / str(dependency['fileID'])
         if depCacheDir.is_dir():
             # File is cached
@@ -134,8 +133,6 @@ def doDownload(manifest):
                 shutil.copyfile(str(depFile), str(targetFile))
                 programGui.setOutput("[%d/%d] %s (cached)" % (i, iLen, targetFile.name))
 
-                i += 1
-
                 # Cache access is successful,
                 # Don't download the file
                 continue
@@ -143,33 +140,28 @@ def doDownload(manifest):
         # File is not cached and needs to be downloaded
         projectResponse = sess.get("http://minecraft.curseforge.com/mc-mods/%s" % (dependency['projectID']), stream=True)
         fileResponse = sess.get("%s/files/%s/download" % (projectResponse.url, dependency['fileID']), stream=True)
-        while fileResponse.is_redirect:
-            source = fileResponse
-            fileResponse = sess.get(source, stream=True)
         filePath = Path(fileResponse.url)
         fileName = unquote(filePath.name)
         print("[%d/%d] %s" % (i, iLen, fileName))
         programGui.setOutput("[%d/%d] %s" % (i, iLen, fileName))
-        with open(str(minecraftPath / "mods" / fileName), "wb") as mod:
-            mod.write(fileResponse.content)
+        mod_filename = str(minecraftPath / "mods" / fileName)
+        with open(mod_filename, "wb") as mod:
+            for chunk in fileResponse.iter_content(chunk_size=1024*512):
+                if chunk:
+                    mod.write(chunk)
 
         # Try to add file to cache.
         if not depCacheDir.exists():
             depCacheDir.mkdir(parents=True)
-            with open(str(depCacheDir / fileName), "wb") as mod:
-                mod.write(fileResponse.content)
-
-        i += 1
+            shutil.copyfile(mod_filename, str(depCacheDir / fileName))
 
     # This is not available in curse-only packs
     if 'directDownload' in manifestJson:
-        i = 1
         i_len = len(manifestJson['directDownload'])
         programGui.setOutput("%d additional files to download." % i_len)
-        for download_entry in manifestJson['directDownload']:
+        for i, download_entry in enumerate(manifestJson['directDownload'], start=1):
             if "url" not in download_entry or "filename" not in download_entry:
                 programGui.setOutput("[%d/%d] <Error>" % (i, i_len))
-                i += 1
                 continue
             source_url = urlparse(download_entry['url'])
             download_cache_children = Path(source_url.path).parent.relative_to('/')
@@ -179,22 +171,16 @@ def doDownload(manifest):
                 # Cached
                 target_file = minecraftPath / "mods" / cache_target.name
                 shutil.copyfile(str(cache_target), str(target_file))
-
-                i += 1
-
                 # Cache access is successful,
                 # Don't download the file
                 continue
             # File is not cached and needs to be downloaded
             file_response = sess.get(source_url, stream=True)
-            while file_response.is_redirect:
-                source = file_response
-                file_response = sess.get(source, stream=True)
             programGui.setOutput("[%d/%d] %s" % (i, i_len, download_entry['filename']))
             with open(str(minecraftPath / "mods" / download_entry['filename']), "wb") as mod:
-                mod.write(file_response.content)
-
-            i += 1
+                for chunk in file_response.iter_content(chunk_size=1024*512):
+                    if chunk:
+                        mod.write(chunk)
 
 if args.gui:
     programGui = downloadUI()