diff --git a/README.md b/README.md
index c66814e..a225944 100644
--- a/README.md
+++ b/README.md
@@ -178,3 +178,17 @@ cd w10install
 
 ```
 
+# 4. Get/Install essential building tools and software
+
+
+## 4.1 Windows ADK
+
+The Windows ADK contains the Windows Image Manager and some other essential tools.
+
+You can try to download it with the script "download-software.cmd" and then execute "install-adk.cmd". Or you can get it manually under: https://docs.microsoft.com/en-US/windows-hardware/get-started/adk-install
+
+Save it in folder "software" and install it with:
+```dos
+adksetup.exe /q /ceip off /norestart /features OptionId.DeploymentTools
+
+```
diff --git a/software/download-software.cmd b/software/download-software.cmd
index 3dda8c0..3a0d24d 100644
--- a/software/download-software.cmd
+++ b/software/download-software.cmd
@@ -11,20 +11,29 @@ rem MAIN loop ( download software ) ...
 rem ###################################
 
 FOR /F "tokens=1,2 delims=, " %%E in (%LISTFILE%) do (
-  echo getting: [ %%E ] from [ %%F ]
 
-  curl -L %%E --output %%F
-
-  IF %%~zF == 0 (
-    echo ERROR: size of %%F is 0 bytes
-    del /F %%F
-  ) ELSE (
-    echo INFO: size of %%F is %%~zF bytes
+  rem file is already present ?
+  IF %%~zF EQU 0 (
+    del /F %%F 2>nul
+    echo INFO: [ %%F ] does not exist or is 0 bytes, starting download ...
   )
 
-  if NOT EXIST %%F (
-  echo ERROR: couldn't get %%F! 
-    exit /b
+  IF NOT EXIST %%F (
+
+    rem get it with curl ...
+    echo getting: [ %%E ] from [ %%F ]
+    curl --connect-timeout 5 --fail-early -L %%E --output %%F
+
+    rem success ?
+    if NOT EXIST %%F (
+      echo ERROR: couldn't get %%F!
+    ) ELSE (
+      rem check size (it SHOULD NOT be 0!)
+      FORFILES /M %%F /C "cmd /C if @fsize EQU 0 echo ERROR: file @relpath is zero size!"
+    )
+
+  ) ELSE (
+    FORFILES /M %%F /C "cmd /C if @fsize NEQ 0 echo OK: file @relpath is [ @fsize ] bytes"
   )
 
 )
diff --git a/software/softwarelist.csv b/software/softwarelist.csv
index 801cdcd..8e08a61 100644
--- a/software/softwarelist.csv
+++ b/software/softwarelist.csv
@@ -1 +1,2 @@
 http://download.spotify.com/SpotifyFullSetup.exe spotify.exe
+https://go.microsoft.com/fwlink/?linkid=2120254 adksetup.exe