Additional fixes and updates to the native code

Author: turnham

llmware/lib/windows/x86_64/llmware/libgraph_llmware.dll

@@ -403,7 +403,7 @@ def pull_single_model_from_llmware_public_repo(self, model_name=None):
 
                 #   simple model_repo structure - each model is a separate folder
                 #   each model is a 'flat list' of files, so safe to split on ("/") to get key name
-                if not file.key.endswith(os.sep):
+                if not file.key.endswith('/'):
                     local_file_path = os.path.join(local_model_folder,file.key.split('/')[-1])
                     bucket.download_file(file.key, local_file_path)