diff --git a/.github/scripts/Linux/prepare.sh b/.github/scripts/Linux/prepare.sh
index 33ecd92dc..6b37a2f6a 100755
--- a/.github/scripts/Linux/prepare.sh
+++ b/.github/scripts/Linux/prepare.sh
@@ -76,18 +76,17 @@ if [ -n "$SDK_URL" ]; then
 fi
 
 # Install NDI
-if [ -n "$SDK_URL" ]; then
-        if curl -f -S $SDK_URL/NDISDK_Linux.tar.gz -O; then
-                tar -C /var/tmp -xzf NDISDK_Linux.tar.gz
-                yes | PAGER=cat /var/tmp/Install*NDI*sh
-                sudo cp -r NDI\ SDK\ for\ Linux/include/* /usr/local/include
-                cat NDI\ SDK\ for\ Linux/Version.txt | sed 's/\(.*\)/\#define NDI_VERSION \"\1\"/' | sudo tee /usr/local/include/ndi_version.h
-                sudo cp -r NDI\ SDK\ for\ Linux/lib/x86_64-linux-gnu/* /usr/local/lib
-                FEATURES="${FEATURES:+$FEATURES }--enable-ndi"
-                echo "FEATURES=$FEATURES" >> $GITHUB_ENV
-                sudo ldconfig
-        fi
-fi
+install_ndi() {
+(
+        cd /var/tmp
+        tar -xzf Install_NDI_SDK_Linux.tar.gz
+        yes | PAGER=cat ./Install*NDI*sh
+        sudo cp -r NDI\ SDK\ for\ Linux/include/* /usr/local/include
+        cat NDI\ SDK\ for\ Linux/Version.txt | sed 's/\(.*\)/\#define NDI_VERSION \"\1\"/' | sudo tee /usr/local/include/ndi_version.h
+        sudo cp -r NDI\ SDK\ for\ Linux/lib/x86_64-linux-gnu/* /usr/local/lib
+        sudo ldconfig
+)
+}
 
 # Install live555
 git clone https://github.com/xanview/live555/
@@ -98,6 +97,8 @@ make -j $(nproc) CPLUSPLUS_COMPILER="c++ -DXLOCALE_NOT_USED"
 sudo make install
 cd ..
 
+install_ndi
+
 # Install cross-platform deps
 $GITHUB_WORKSPACE/.github/scripts/install-common-deps.sh
 
diff --git a/.github/scripts/Windows/prepare.ps1 b/.github/scripts/Windows/prepare.ps1
index ce4ca7b2c..781381430 100644
--- a/.github/scripts/Windows/prepare.ps1
+++ b/.github/scripts/Windows/prepare.ps1
@@ -18,19 +18,12 @@ Start-Process -FilePath .\XIMEA_API_Installer.exe -ArgumentList "/S /SecXiApi=ON
 Remove-Item XIMEA_API_Installer.exe
 
 # Install NDI
-if (${env:SDK_URL}) {
-  try {
-    Invoke-WebRequest ${env:SDK_URL}/NDI_SDK.exe -OutFile C:\ndi.exe
-    # TODO: NDI installer opens a manual in a browser and doesn't end, thus StartProcess with -Wait
-    # waits infinitely. Therefore, there is a hack with Sleep (and not removint the installer)
-    #Start-Process -FilePath "C:\ndi.exe" -ArgumentList "/VERYSILENT" -Wait -NoNewWindow
-    Start-Process -FilePath "C:\ndi.exe" -ArgumentList "/VERYSILENT"
-    Sleep 10
-    $sdk=(dir "C:\Program Files\NDI" -Filter *SDK -Name)
-    echo "C:\Program Files\NDI\$sdk\Bin\x64" >> ${env:GITHUB_PATH}
-    #Remove-Item C:\ndi.exe
-  } catch {
-    Write-Output "Status Code --- $($_.Exception.Response.StatusCode.Value__) "
-  }
-}
+# TODO: NDI installer opens a manual in a browser and doesn't end, thus StartProcess with -Wait
+# waits infinitely. Therefore, there is a hack with Sleep (and not removint the installer)
+#Start-Process -FilePath "C:\ndi.exe" -ArgumentList "/VERYSILENT" -Wait -NoNewWindow
+Start-Process -FilePath "C:\ndi.exe" -ArgumentList "/VERYSILENT"
+Sleep 10
+$sdk=(dir "C:\Program Files\NDI" -Filter *SDK -Name)
+echo "C:\Program Files\NDI\$sdk\Bin\x64" >> ${env:GITHUB_PATH}
+#Remove-Item C:\ndi.exe
 
diff --git a/.github/scripts/Windows/prepare_msys.sh b/.github/scripts/Windows/prepare_msys.sh
index 153325404..2de318bab 100644
--- a/.github/scripts/Windows/prepare_msys.sh
+++ b/.github/scripts/Windows/prepare_msys.sh
@@ -20,7 +20,6 @@ if test -d /c/Program\ Files/NDI; then
         export CPATH=$CPATH:$NDI_D/Include
         export LIBRARY_PATH=$LIBRARY_PATH:$NDI_D/Lib/x64
         cat $NDI_D/Version.txt | sed 's/\(.*\)/\#define NDI_VERSION \"\1\"/' | tee /usr/local/include/ndi_version.h
-        FEATURES="$FEATURES --enable-ndi"
 fi
 
 JACK_D=/c/Program\ Files/JACK2
diff --git a/.github/scripts/macOS/prepare.sh b/.github/scripts/macOS/prepare.sh
index 0f9a98000..a039939d9 100755
--- a/.github/scripts/macOS/prepare.sh
+++ b/.github/scripts/macOS/prepare.sh
@@ -53,8 +53,8 @@ if [ -d $DELTA_CACHE_INST ]; then
 fi
 
 # Install NDI
-if [ -f $SDK_NONFREE_PATH/NDISDK_Apple.pkg  ]; then
-        sudo installer -pkg $SDK_NONFREE_PATH/NDISDK_Apple.pkg -target /
+install_ndi() {
+        sudo installer -pkg /private/var/tmp/Install_NDI_SDK_Apple.pkg -target /
         sudo mv /Library/NDI\ SDK\ for\ * /Library/NDI
         cat /Library/NDI/Version.txt | sed 's/\(.*\)/\#define NDI_VERSION \"\1\"/' | sudo tee /usr/local/include/ndi_version.h
         if [ -d /Library/NDI/lib/x64 ]; then # NDI 4
@@ -70,12 +70,10 @@ if [ -f $SDK_NONFREE_PATH/NDISDK_Apple.pkg  ]; then
         export MY_DYLD_LIBRARY_PATH="${MY_DYLD_LIBRARY_PATH:+$MY_DYLD_LIBRARY_PATH:}$NDI_LIB"
         echo "CPATH=$CPATH" >> $GITHUB_ENV
         echo "DYLIBBUNDLER_FLAGS=$DYLIBBUNDLER_FLAGS" >> $GITHUB_ENV
-        FEATURES="$FEATURES --enable-ndi"
-        echo "FEATURES=$FEATURES" >> $GITHUB_ENV
         echo "LIBRARY_PATH=$LIBRARY_PATH" >> $GITHUB_ENV
         echo "MY_DYLD_LIBRARY_PATH=$MY_DYLD_LIBRARY_PATH" >> $GITHUB_ENV
         cd $TEMP_INST
-fi
+}
 
 # Install live555
 git clone https://github.com/xanview/live555/
@@ -90,6 +88,8 @@ wget --no-verbose https://github.com/Syphon/Syphon-Framework/releases/download/5
 unzip Syphon.SDK.5.zip
 sudo cp -R 'Syphon SDK 5/Syphon.framework' /Library/Frameworks
 
+install_ndi
+
 # Install cross-platform deps
 $GITHUB_WORKSPACE/.github/scripts/install-common-deps.sh
 
diff --git a/.github/workflows/README.md b/.github/workflows/README.md
index ca4d2bce4..1679aa54b 100644
--- a/.github/workflows/README.md
+++ b/.github/workflows/README.md
@@ -26,20 +26,17 @@ Further subsection briefly describe individual assets and how to obtain them.  A
 are unmodified files downloaded from vendor website. However, rename may be required.
 
 ### Linux
-- **NDISDK\_Linux.tar.gz** - [NDI SDK](https://ndi.tv/sdk/) installer for Linux
 - **ntv2sdklinux.zip** - Linux NTV2 SDK ([AJA](https://sdksupport.aja.com/))
 
 **Note:** _VideoMaster SDK_ is not used because DELTACAST doesn't provide redistributable
 libraries for Linux (as does for macOS and Windows).
 
 ### macOS
-- **NDISDK\_Apple.pkg** - NDI SDK for macOS from NewTek
 - **ntv2sdkmac.zip** - NTV2 SDK downloaded from AJA
 - **VideoMaster\_SDK\_MacOSX.zip** - VideoMaster SDK for Mac from
   [DELTACAST](https://www.deltacast.tv/support/download-center)
 
 ### Windows
-- **NDI\_SDK.exe** - Windows NDI installer downloaded from NewTek
 - **ntv2sdkwin.zip** - NTV2 SDK downloaded from AJA
 - **VideoMaster\_SDK\_Windows.zip** - VideoMaster SDK from DELTACAST for Windows
 
diff --git a/.github/workflows/ccpp.yml b/.github/workflows/ccpp.yml
index 31c49d952..82c23adbc 100644
--- a/.github/workflows/ccpp.yml
+++ b/.github/workflows/ccpp.yml
@@ -1,7 +1,7 @@
 name: C/C++ CI
 
 env:
-  FEATURES: '--enable-option-checking=fatal --with-live555=/usr/local --enable-blank --enable-cineform --enable-decklink --enable-file --enable-gl --enable-jack --enable-jack-transport --enable-libavcodec --enable-natpmp --enable-openssl --enable-pcp --enable-portaudio --enable-qt --enable-rtdxt --enable-rtsp --enable-rtsp-server --enable-scale --enable-sdl2 --enable-sdp-http --enable-speexdsp --enable-swmix --enable-libswscale --enable-text --enable-video-mixer --enable-ximea --enable-zfec'
+  FEATURES: '--enable-option-checking=fatal --with-live555=/usr/local --enable-blank --enable-cineform --enable-decklink --enable-file --enable-gl --enable-jack --enable-jack-transport --enable-libavcodec --enable-natpmp --enable-ndi --enable-openssl --enable-pcp --enable-portaudio --enable-qt --enable-rtdxt --enable-rtsp --enable-rtsp-server --enable-scale --enable-sdl2 --enable-sdp-http --enable-speexdsp --enable-swmix --enable-libswscale --enable-text --enable-video-mixer --enable-ximea --enable-zfec'
   CUDA_FEATURES: '--enable-cuda_dxt --enable-gpujpeg --enable-ldgm-gpu --enable-uyvy'
 
 on:
@@ -62,6 +62,19 @@ jobs:
 
     steps:
     - uses: actions/checkout@v1
+    - name: Fetch SDKs ETags
+      id: etags
+      run: |
+        echo "::set-output name=ndi::$($GITHUB_WORKSPACE/.github/scripts/get-etags.sh https://downloads.ndi.tv/SDK/NDI_SDK_Linux/Install_NDI_SDK_v5_Linux.tar.gz)"
+    - name: Cache NDI
+      id: cache-ndi
+      uses: actions/cache@v2
+      with:
+        path: /var/tmp/Install_NDI_SDK_Linux.tar.gz
+        key: cache-ndi-${{ runner.os }}-${{ steps.etags.outputs.ndi }}
+    - name: Download NDI
+      if: steps.cache-ndi.outputs.cache-hit != 'true'
+      run: curl -L https://downloads.ndi.tv/SDK/NDI_SDK_Linux/Install_NDI_SDK_v5_Linux.tar.gz -o /var/tmp/Install_NDI_SDK_Linux.tar.gz
     - name: bootstrap
       run: |
            . .github/scripts/environment.sh
@@ -148,6 +161,7 @@ jobs:
       run: |
         echo "::set-output name=free::$($GITHUB_WORKSPACE/.github/scripts/macOS/prepare_free_sdks.sh -e)"
         echo "::set-output name=nonfree::$($GITHUB_WORKSPACE/.github/scripts/get-etags.sh $SDK_URL/ntv2sdkmac.zip $SDK_URL/VideoMaster_SDK_MacOSX.zip $SDK_URL/NDISDK_Apple.pkg)"
+        echo "::set-output name=ndi::$($GITHUB_WORKSPACE/.github/scripts/get-etags.sh https://downloads.ndi.tv/SDK/NDI_SDK_Mac/Install_NDI_SDK_v5_Apple.pkg)"
     - name: Cache Non-Free SDKs
       id: cache-macos-nonfree-sdks
       uses: actions/cache@v2
@@ -160,7 +174,7 @@ jobs:
         rm -rf ${{ env.SDK_NONFREE_PATH }}
         mkdir -p ${{ env.SDK_NONFREE_PATH }}
         cd ${{ env.SDK_NONFREE_PATH }}
-        curl -S -f -O $SDK_URL/ntv2sdkmac.zip --next -f -O $SDK_URL/VideoMaster_SDK_MacOSX.zip --next -f -O $SDK_URL/NDISDK_Apple.pkg || true
+        curl -S -f -O $SDK_URL/ntv2sdkmac.zip --next -f -O $SDK_URL/VideoMaster_SDK_MacOSX.zip || true
         $GITHUB_WORKSPACE/.github/scripts/macOS/prepare_nonfree_sdks.sh
     - name: Cache Free SDKs
       id: cache-macos-free-sdks
@@ -171,6 +185,15 @@ jobs:
     - name: Download Free SDKs
       if: steps.cache-macos-free-sdks.outputs.cache-hit != 'true'
       run: $GITHUB_WORKSPACE/.github/scripts/macOS/prepare_free_sdks.sh
+    - name: Cache NDI
+      id: cache-ndi
+      uses: actions/cache@v2
+      with:
+        path: /private/var/tmp/Install_NDI_SDK_Apple.pkg
+        key: cache-ndi-${{ runner.os }}-${{ steps.etags.outputs.ndi }}
+    - name: Download NDI
+      if: steps.cache-ndi.outputs.cache-hit != 'true'
+      run: curl -L https://downloads.ndi.tv/SDK/NDI_SDK_Mac/Install_NDI_SDK_v5_Apple.pkg -o /private/var/tmp/Install_NDI_SDK_Apple.pkg
     - name: bootstrap
       run: |
         . .github/scripts/environment.sh
@@ -221,14 +244,24 @@ jobs:
     - uses: actions/checkout@v1
     - name: Fetch SDKs ETags
       id: etags
-      run:
+      run: |
         echo "::set-output name=aja::$($GITHUB_WORKSPACE/.github/scripts/get-etags.sh $SDK_URL/ntv2sdkwin.zip)"
+        echo "::set-output name=ndi::$($GITHUB_WORKSPACE/.github/scripts/get-etags.sh https://downloads.ndi.tv/SDK/NDI_SDK/NDI%205%20SDK.exe)"
       shell: bash
     - name: Set environment
       run: .github/scripts/environment.sh
       shell: bash
     - name: Find MSVC
       run: .github/scripts/Windows/find_msvc.ps1
+    - name: Cache NDI
+      id: cache-ndi
+      uses: actions/cache@v2
+      with:
+        path: 'C:\ndi.exe'
+        key: cache-ndi-${{ runner.os }}-${{ steps.etags.outputs.ndi }}
+    - name: Download NDI
+      if: steps.cache-ndi.outputs.cache-hit != 'true'
+      run: Invoke-WebRequest https://downloads.ndi.tv/SDK/NDI_SDK/NDI%205%20SDK.exe -OutFile C:\ndi.exe
     - name: bootsrap
       run: .github/scripts/Windows/prepare.ps1
     - name: Cache AJA