Create downloads dir if not exists

configure.py

@@ -139,6 +139,9 @@ def dist():
         print("You need to run configure.py build before you can run dist")
         exit(1)
 
+    if not os.path.exists("SuperBuild\\download"):
+        os.mkdir("SuperBuild\\download")
+
     # Download VC++ runtime
     vcredist_path = os.path.join("SuperBuild", "download", "vc_redist.x64.zip")
     if not os.path.isfile(vcredist_path):