diff --unified --recursive --text a/opencv_contrib/cudaoptflow/CMakeLists.txt b/opencv_contrib/cudaoptflow/CMakeLists.txt
--- a/opencv_contrib/cudaoptflow/CMakeLists.txt	2021-06-12 01:35:47.536395972 +0300
+++ b/opencv_contrib/cudaoptflow/CMakeLists.txt	2021-06-12 01:36:02.029498597 +0300
@@ -12,19 +12,6 @@
   set(NVIDIA_OPTICAL_FLOW_2_0_HEADERS_COMMIT "edb50da3cf849840d680249aa6dbef248ebce2ca")
   set(NVIDIA_OPTICAL_FLOW_2_0_HEADERS_MD5 "a73cd48b18dcc0cc8933b30796074191")
   set(NVIDIA_OPTICAL_FLOW_2_0_HEADERS_PATH "${OpenCV_BINARY_DIR}/3rdparty/NVIDIAOpticalFlowSDK_2_0_Headers")
-  ocv_download(FILENAME "${NVIDIA_OPTICAL_FLOW_2_0_HEADERS_COMMIT}.zip"
-                 HASH ${NVIDIA_OPTICAL_FLOW_2_0_HEADERS_MD5}
-                 URL "https://github.com/NVIDIA/NVIDIAOpticalFlowSDK/archive/"
-                 DESTINATION_DIR "${NVIDIA_OPTICAL_FLOW_2_0_HEADERS_PATH}"
-                 STATUS NVIDIA_OPTICAL_FLOW_2_0_HEADERS_DOWNLOAD_SUCCESS
-                 ID "NVIDIA_OPTICAL_FLOW"
-                 UNPACK RELATIVE_URL)
-
-  if(NOT NVIDIA_OPTICAL_FLOW_2_0_HEADERS_DOWNLOAD_SUCCESS)
-    message(STATUS "Failed to download NVIDIA_Optical_Flow_2_0 Headers")
-  else()
-    message(STATUS "Building with NVIDIA Optical Flow API 2.0")
-    add_definitions(-DHAVE_NVIDIA_OPTFLOW=2)
-    ocv_include_directories(SYSTEM "${NVIDIA_OPTICAL_FLOW_2_0_HEADERS_PATH}/NVIDIAOpticalFlowSDK-${NVIDIA_OPTICAL_FLOW_2_0_HEADERS_COMMIT}")
-  endif()
-endif()
\ No newline at end of file
+  add_definitions(-DHAVE_NVIDIA_OPTFLOW=2)
+  ocv_include_directories(SYSTEM "${NVIDIA_OPTICAL_FLOW_2_0_HEADERS_PATH}")
+endif()