diff --git a/cmake/SuperBuild.cmake b/cmake/SuperBuild.cmake
index bccaef03..092b78f1 100644
--- a/cmake/SuperBuild.cmake
+++ b/cmake/SuperBuild.cmake
@@ -16,6 +16,10 @@ macro(set_vars VAR_OUT)
 endmacro()
 #######################################################################
 if(WIN32)
+  set (DEPS_DOWNLOAD_URL "https://github.com/NGSolve/ngsolve_dependencies/releases/download/v1.0.0" CACHE STRING INTERNAL)
+  set (OCC_DOWNLOAD_URL_WIN "${DEPS_DOWNLOAD_URL}/occ_win64.zip" CACHE STRING INTERNAL)
+  set (TCLTK_DOWNLOAD_URL_WIN "${DEPS_DOWNLOAD_URL}/tcltk_win64.zip" CACHE STRING INTERNAL)
+  set (ZLIB_DOWNLOAD_URL_WIN "${DEPS_DOWNLOAD_URL}/zlib_win64.zip" CACHE STRING INTERNAL)
   if(NOT CMAKE_CXX_COMPILER_ID STREQUAL "Intel")
     string(REGEX REPLACE "/W[0-4]" "/W0" CMAKE_CXX_FLAGS_NEW ${CMAKE_CXX_FLAGS})
     set(CMAKE_CXX_FLAGS ${CMAKE_CXX_FLAGS_NEW} CACHE STRING "compile flags" FORCE)
@@ -28,16 +32,6 @@ if(WIN32)
     set(CMAKE_EXE_LINKER_FLAGS"${CMAKE_EXE_LINKER_FLAGS_NEW}/IGNORE:4217,4049" CACHE STRING "compile flags" FORCE)
 
   endif(NOT CMAKE_CXX_COMPILER_ID STREQUAL "Intel")
-
-  if(${CMAKE_SIZEOF_VOID_P} MATCHES 4)
-    # 32 bit
-    set(EXT_LIBS_DOWNLOAD_URL_WIN "http://www.asc.tuwien.ac.at/~mhochsteger/ngsuite/ext_libs32.zip" CACHE STRING INTERNAL)
-    set(OCC_DOWNLOAD_URL_WIN "http://www.asc.tuwien.ac.at/~mhochsteger/ngsuite/occ32.zip" CACHE STRING INTERNAL)
-  else(${CMAKE_SIZEOF_VOID_P} MATCHES 4)
-    # 64 bit
-    set(EXT_LIBS_DOWNLOAD_URL_WIN "http://www.asc.tuwien.ac.at/~mhochsteger/ngsuite/ext_libs64.zip" CACHE STRING INTERNAL)
-    set(OCC_DOWNLOAD_URL_WIN "http://www.asc.tuwien.ac.at/~mhochsteger/ngsuite/occ64.zip" CACHE STRING INTERNAL)
-  endif(${CMAKE_SIZEOF_VOID_P} MATCHES 4)
 endif(WIN32)
 
 if(UNIX)
@@ -93,6 +87,7 @@ endif(USE_OCC AND WIN32 AND NOT OCC_INCLUDE_DIR)
 
 #######################################################################
 
+include(cmake/external_projects/zlib.cmake)
 if(USE_GUI)
   include(cmake/external_projects/tcltk.cmake)
 endif(USE_GUI)
diff --git a/cmake/external_projects/tcltk.cmake b/cmake/external_projects/tcltk.cmake
index 1937ec14..3ef3c6b5 100644
--- a/cmake/external_projects/tcltk.cmake
+++ b/cmake/external_projects/tcltk.cmake
@@ -75,8 +75,8 @@ list(APPEND NETGEN_DEPENDENCIES project_tkdnd)
 
 elseif(WIN32)
 
-  ExternalProject_Add(project_win_extlibs
-    URL ${EXT_LIBS_DOWNLOAD_URL_WIN}
+  ExternalProject_Add(project_win_tcltk
+    URL ${TCLTK_DOWNLOAD_URL_WIN}
     UPDATE_COMMAND "" # Disable update
     BUILD_IN_SOURCE 1
     CONFIGURE_COMMAND ""
@@ -87,10 +87,10 @@ elseif(WIN32)
 
   set (TK_INCLUDE_PATH ${CMAKE_INSTALL_PREFIX}/include)
   set (TCL_INCLUDE_PATH ${CMAKE_INSTALL_PREFIX}/include)
-  set (TCL_LIBRARY ${CMAKE_INSTALL_PREFIX}/lib/tcl86.lib)
-  set (TK_LIBRARY ${CMAKE_INSTALL_PREFIX}/lib/tk86.lib)
+  set (TCL_LIBRARY ${CMAKE_INSTALL_PREFIX}/lib/tcl86t.lib)
+  set (TK_LIBRARY ${CMAKE_INSTALL_PREFIX}/lib/tk86t.lib)
 
-  list(APPEND NETGEN_DEPENDENCIES project_win_extlibs)
+  list(APPEND NETGEN_DEPENDENCIES project_win_tcltk)
 else(WIN32)
     find_package(TCL 8.5 REQUIRED)
 #     ExternalProject_Add(project_tkdnd
diff --git a/cmake/external_projects/zlib.cmake b/cmake/external_projects/zlib.cmake
new file mode 100644
index 00000000..c655090f
--- /dev/null
+++ b/cmake/external_projects/zlib.cmake
@@ -0,0 +1,16 @@
+if(WIN32)
+
+  ExternalProject_Add(project_win_zlib
+    URL ${ZLIB_DOWNLOAD_URL_WIN}
+    UPDATE_COMMAND "" # Disable update
+    BUILD_IN_SOURCE 1
+    CONFIGURE_COMMAND ""
+    BUILD_COMMAND ""
+    INSTALL_COMMAND ${CMAKE_COMMAND} -E copy_directory . ${CMAKE_INSTALL_PREFIX}
+    LOG_DOWNLOAD 1
+    )
+
+
+  list(APPEND NETGEN_DEPENDENCIES project_win_zlib)
+endif(WIN32)
+