add loader and versioning

Azaion.Loader/api_client.pyx

@@ -143,8 +143,9 @@ cdef class ApiClient:
         if self.cdn_manager.download(folder, big_part):
             with open(path.join(<str> folder, big_part), 'rb') as binary_file:
                 encrypted_bytes_big = binary_file.read()
+            # return encrypted_bytes_big
         else:
-            return None
+            raise Exception(f'Cannot download file {folder}\\{big_part} from CDN!')
 
     cdef load_big_small_resource(self, str resource_name, str folder):
         cdef str big_part = f'{resource_name}.big'