diff --git a/3rdparty/ext_exiv2/CMakeLists.txt b/3rdparty/ext_exiv2/CMakeLists.txt
index 91e687107d..b761d56015 100644
--- a/3rdparty/ext_exiv2/CMakeLists.txt
+++ b/3rdparty/ext_exiv2/CMakeLists.txt
@@ -1,42 +1,42 @@
 SET(PREFIX_ext_exiv2  "${EXTPREFIX}" )
 
 if (ANDROID)
 ExternalProject_Add( ext_exiv2
 	DOWNLOAD_DIR ${EXTERNALS_DOWNLOAD_DIR}
-	URL https://api.github.com/repos/Exiv2/exiv2/tarball/v0.27.2
-	URL_MD5 38c991d96ec293d24db9516eb923f205
+	URL https://github.com/libexpat/libexpat/releases/download/R_2_2_9/expat-2.2.9.tar.gz
+	URL_MD5 077b953cc38df8fed78e92841cc35443
 
     PATCH_COMMAND ${PATCH_COMMAND} -p1 -i ${CMAKE_CURRENT_SOURCE_DIR}/tzname.patch
     COMMAND ${PATCH_COMMAND} -p1 -i ${CMAKE_CURRENT_SOURCE_DIR}/patch_mingw.patch
     COMMAND ${PATCH_COMMAND} -p1 -i ${CMAKE_CURRENT_SOURCE_DIR}/disable_exiv_apps.diff
     COMMAND ${PATCH_COMMAND} -p1 -i ${CMAKE_CURRENT_SOURCE_DIR}/gcccheck.patch
 
 	INSTALL_DIR ${PREFIX_ext_exiv2}
     CMAKE_ARGS -DCMAKE_INSTALL_PREFIX=${PREFIX_ext_exiv2} -DCMAKE_BUILD_TYPE=${GLOBAL_BUILD_TYPE} ${GLOBAL_PROFILE} -DEXIV2_BUILD_SAMPLES=OFF -DICONV_LIBRARY=${PREFIX_ext_exiv2}/lib -DEXIV2_ENABLE_NLS=OFF -DICONV_INCLUDE_DIR=${PREFIX_ext_exiv2}/include -DEXPAT_LIBRARY=$ENV{BUILD_ROOT}/i/lib/libexpat.so -DEXPAT_INCLUDE_DIR=$ENV{BUILD_ROOT}/i/include -DEXIV2_BUILD_EXIV2_COMMAND=OFF
 	UPDATE_COMMAND ""
     INSTALL_COMMAND $(MAKE) install
 	DEPENDS ext_iconv ext_expat
 )
 
 
 else()
 message(STATUS ${PREFIX_ext_exiv2}/lib)
 ExternalProject_Add( ext_exiv2
 	DOWNLOAD_DIR ${EXTERNALS_DOWNLOAD_DIR}
-	URL https://api.github.com/repos/Exiv2/exiv2/tarball/v0.27.2
-	URL_MD5 38c991d96ec293d24db9516eb923f205
+	URL https://github.com/libexpat/libexpat/releases/download/R_2_2_9/expat-2.2.9.tar.gz
+	URL_MD5 077b953cc38df8fed78e92841cc35443
 
     PATCH_COMMAND ${PATCH_COMMAND} -p1 -i ${CMAKE_CURRENT_SOURCE_DIR}/tzname.patch
     COMMAND ${PATCH_COMMAND} -p1 -i ${CMAKE_CURRENT_SOURCE_DIR}/patch_mingw.patch
     COMMAND ${PATCH_COMMAND} -p1 -i ${CMAKE_CURRENT_SOURCE_DIR}/disable_exiv_apps.diff
     COMMAND ${PATCH_COMMAND} -p1 -i ${CMAKE_CURRENT_SOURCE_DIR}/gcccheck.patch
 	COMMAND ${PATCH_COMMAND} -p1 -i ${CMAKE_CURRENT_SOURCE_DIR}/01_fpermissive_error.patch
 	
 	INSTALL_DIR ${PREFIX_ext_exiv2}
 	CMAKE_ARGS -DCMAKE_INSTALL_PREFIX=${PREFIX_ext_exiv2} -DCMAKE_LIBRARY_PATH=${PREFIX_ext_exiv2}/lib -DCMAKE_BUILD_TYPE=${GLOBAL_BUILD_TYPE} ${GLOBAL_PROFILE} -DEXIV2_BUILD_SAMPLES=OFF -DIconv_INCLUDE_DIR=${PREFIX_ext_exiv2}/include -DEXIV2_ENABLE_NLS=OFF -DEXIV2_BUILD_EXIV2_COMMAND=OFF
 
 	UPDATE_COMMAND ""
     INSTALL_COMMAND $(MAKE) install
 	DEPENDS ext_iconv ext_expat
 )
 endif()
diff --git a/3rdparty/ext_expat/CMakeLists.txt b/3rdparty/ext_expat/CMakeLists.txt
index 1e533f9c20..ec24aae738 100644
--- a/3rdparty/ext_expat/CMakeLists.txt
+++ b/3rdparty/ext_expat/CMakeLists.txt
@@ -1,48 +1,48 @@
 SET(PREFIX_ext_expat "${EXTPREFIX}" )
 
 if (WIN32)
 ExternalProject_Add( ext_expat
 	DOWNLOAD_DIR ${EXTERNALS_DOWNLOAD_DIR}
-	URL https://api.github.com/repos/libexpat/libexpat/tarball/R_2_2_9
-	URL_MD5 045c3b3ea0fc55f3565cb117e1669493
+	URL https://github.com/libexpat/libexpat/releases/download/R_2_2_9/expat-2.2.9.tar.gz
+	URL_MD5 077b953cc38df8fed78e92841cc35443
 
 	PATCH_COMMAND ${PATCH_COMMAND} -p1 -i ${CMAKE_CURRENT_SOURCE_DIR}/expat-2.2.9-b9bd355.diff
 	INSTALL_DIR ${PREFIX_ext_expat}
 	SOURCE_SUBDIR expat
 	CMAKE_ARGS -DCMAKE_INSTALL_PREFIX=${PREFIX_ext_expat} -DBUILD_tests=OFF -DBUILD_examples=OFF -DBUILD_tools=OFF -DCMAKE_BUILD_TYPE=${GLOBAL_BUILD_TYPE} ${GLOBAL_PROFILE}
 	UPDATE_COMMAND ""
 
 	DEPENDS ext_patch
 )
 
 elseif (ANDROID)
 ExternalProject_Add( ext_expat
 	DOWNLOAD_DIR ${EXTERNALS_DOWNLOAD_DIR}
-	URL https://api.github.com/repos/libexpat/libexpat/tarball/R_2_2_9
-	URL_MD5 045c3b3ea0fc55f3565cb117e1669493
+	URL https://github.com/libexpat/libexpat/releases/download/R_2_2_9/expat-2.2.9.tar.gz
+	URL_MD5 077b953cc38df8fed78e92841cc35443
 
 	INSTALL_DIR ${PREFIX_ext_expat}
     CMAKE_ARGS -DCMAKE_INSTALL_PREFIX=${PREFIX_ext_expat} -DCMAKE_BUILD_TYPE=${GLOBAL_BUILD_TYPE} ${GLOBAL_PROFILE} <SOURCE_DIR>/expat
 	BUILD_COMMAND make
 	INSTALL_COMMAND make install
 
 	UPDATE_COMMAND ""
 )
 
 else()
 
 ExternalProject_Add( ext_expat
 	DOWNLOAD_DIR ${EXTERNALS_DOWNLOAD_DIR}
-	URL https://api.github.com/repos/libexpat/libexpat/tarball/R_2_2_9
-	URL_MD5 045c3b3ea0fc55f3565cb117e1669493
+	URL https://github.com/libexpat/libexpat/releases/download/R_2_2_9/expat-2.2.9.tar.gz
+	URL_MD5 077b953cc38df8fed78e92841cc35443
 
 	INSTALL_DIR ${PREFIX_ext_expat}
 	CONFIGURE_COMMAND ${CMAKE_COMMAND} -DCMAKE_INSTALL_PREFIX=${PREFIX_ext_expat} -DCMAKE_BUILD_TYPE=${GLOBAL_BUILD_TYPE} ${GLOBAL_PROFILE} <SOURCE_DIR>/expat
 	BUILD_COMMAND make
 	INSTALL_COMMAND make install
 
 	UPDATE_COMMAND ""
 
 )
 
 endif()
diff --git a/3rdparty/ext_iconv/CMakeLists.txt b/3rdparty/ext_iconv/CMakeLists.txt
index f9c7f8e52d..f977c5c852 100644
--- a/3rdparty/ext_iconv/CMakeLists.txt
+++ b/3rdparty/ext_iconv/CMakeLists.txt
@@ -1,29 +1,29 @@
 SET(PREFIX_ext_iconv "${EXTPREFIX}" )
 if (MINGW)
 ExternalProject_Add( ext_iconv
 	DOWNLOAD_DIR ${EXTERNALS_DOWNLOAD_DIR}
-	URL https://api.github.com/repos/win-iconv/win-iconv/tarball/v0.0.8
-	URL_MD5 e5ce777bbc364c7c797ad8628a59966f
+	URL https://github.com/win-iconv/win-iconv/archive/v0.0.8.tar.gz
+	URL_MD5 https://github.com/win-iconv/win-iconv/archive/v0.0.8.tar.gz
 	
     INSTALL_DIR ${PREFIX_ext_iconv}
 	CMAKE_ARGS -DCMAKE_INSTALL_PREFIX=${PREFIX_ext_iconv} -DCMAKE_BUILD_TYPE=${GLOBAL_BUILD_TYPE} ${GLOBAL_PROFILE}
 
 	UPDATE_COMMAND ""
 )
 else ()
 ExternalProject_Add( ext_iconv
 	DOWNLOAD_DIR ${EXTERNALS_DOWNLOAD_DIR}
 	URL https://ftp.gnu.org/pub/gnu/libiconv/libiconv-1.16.tar.gz
 	URL_MD5 7d2a800b952942bb2880efb00cfd524c
 	
     INSTALL_DIR ${PREFIX_ext_iconv}
     PATCH_COMMAND ${PATCH_COMMAND} -p1 -i ${CMAKE_CURRENT_SOURCE_DIR}/iconv.diff
 	CONFIGURE_COMMAND ./configure --prefix=${PREFIX_ext_iconv}  ${GLOBAL_AUTOMAKE_PROFILE}
     BUILD_COMMAND make
     INSTALL_COMMAND make install
 	
     UPDATE_COMMAND ""
 	BUILD_IN_SOURCE 1
 )
 
 endif ()
diff --git a/3rdparty/ext_openexr/CMakeLists.txt b/3rdparty/ext_openexr/CMakeLists.txt
index 140557da4f..ba4084aa76 100644
--- a/3rdparty/ext_openexr/CMakeLists.txt
+++ b/3rdparty/ext_openexr/CMakeLists.txt
@@ -1,32 +1,32 @@
 SET(EXTPREFIX_openexr "${EXTPREFIX}" )
 if (MINGW)
 ExternalProject_Add( ext_openexr
         DOWNLOAD_DIR ${EXTERNALS_DOWNLOAD_DIR}
-        URL https://api.github.com/repos/AcademySoftwareFoundation/openexr/tarball/v2.4.0
-        URL_MD5 a22f9f2eeed5ef20e18b68018af0d429
+        URL https://github.com/AcademySoftwareFoundation/openexr/archive/v2.4.0.tar.gz
+        URL_MD5 9e4d69cf2a12c6fb19b98af7c5e0eaee
 
         PATCH_COMMAND ${PATCH_COMMAND} -p1 -i ${CMAKE_CURRENT_SOURCE_DIR}/openexr.diff
               COMMAND ${PATCH_COMMAND} -p1 -i ${CMAKE_CURRENT_SOURCE_DIR}/symlink.patch
               COMMAND ${PATCH_COMMAND} -p1 -i ${CMAKE_CURRENT_SOURCE_DIR}/exr_symlink.diff
 
         INSTALL_DIR ${EXTPREFIX_openexr}
         CMAKE_ARGS -DCMAKE_INSTALL_PREFIX=${EXTPREFIX_openexr} -DILMBASE_PACKAGE_PREFIX=${EXTPREFIX_openexr} -DCMAKE_BUILD_TYPE=${GLOBAL_BUILD_TYPE} ${GLOBAL_PROFILE} -DNAMESPACE_VERSIONING=OFF
 
         UPDATE_COMMAND ""
         DEPENDS ext_ilmbase ext_zlib
 )
 else()
 ExternalProject_Add(ext_openexr
         DOWNLOAD_DIR ${EXTERNALS_DOWNLOAD_DIR}
-        URL https://api.github.com/repos/AcademySoftwareFoundation/openexr/tarball/v2.4.0
-        URL_MD5 a22f9f2eeed5ef20e18b68018af0d429
+        URL https://github.com/AcademySoftwareFoundation/openexr/archive/v2.4.0.tar.gz
+        URL_MD5 9e4d69cf2a12c6fb19b98af7c5e0eaee
 
         PATCH_COMMAND ${PATCH_COMMAND} -p1 -i ${CMAKE_CURRENT_SOURCE_DIR}/openexr.diff
 
         INSTALL_DIR ${EXTPREFIX_openexr}
         CMAKE_ARGS -DCMAKE_INSTALL_PREFIX=${EXTPREFIX_openexr} -DILMBASE_PACKAGE_PREFIX=${EXTPREFIX_openexr} -DCMAKE_BUILD_TYPE=${GLOBAL_BUILD_TYPE} ${GLOBAL_PROFILE} -DNAMESPACE_VERSIONING=OFF
 
         UPDATE_COMMAND ""
         DEPENDS ext_ilmbase
 )
 endif()
diff --git a/3rdparty/ext_quazip/CMakeLists.txt b/3rdparty/ext_quazip/CMakeLists.txt
index 15437e38b5..0f1069b6e2 100644
--- a/3rdparty/ext_quazip/CMakeLists.txt
+++ b/3rdparty/ext_quazip/CMakeLists.txt
@@ -1,29 +1,29 @@
 SET(PREFIX_ext_quazip "${EXTPREFIX}" )
 if (ANDROID)
     ExternalProject_Add( ext_quazip
         DOWNLOAD_DIR ${EXTERNALS_DOWNLOAD_DIR}
-        URL https://api.github.com/repos/stachenov/quazip/zipball/v0.8.1
-        URL_MD5 948f74e191d8d111e050720763678280
+        URL https://github.com/stachenov/quazip/archive/v0.8.1.tar.gz
+        URL_MD5 0161c679b1d32c289dab2f96c81354aa
         PATCH_COMMAND ${PATCH_COMMAND} -p1 -i ${CMAKE_CURRENT_SOURCE_DIR}/find_quazip.diff
         COMMAND ${PATCH_COMMAND} -p1 -i ${CMAKE_CURRENT_SOURCE_DIR}/liblocation.diff
         INSTALL_DIR ${PREFIX_ext_quazip}
         CMAKE_ARGS -DCMAKE_INSTALL_PREFIX=${PREFIX_ext_quazip} -DCMAKE_BUILD_TYPE=${GLOBAL_BUILD_TYPE} ${GLOBAL_PROFILE} -DCMAKE_TOOLCHAIN_FILE=${CMAKE_TOOLCHAIN_FILE} -DANDROID_PLATFORM=${ANDROID_PLATFORM} -DQt5Core_DIR=$ENV{QT_ANDROID}/lib/cmake/Qt5Core/ -DANDROID_ABI=${ANDROID_ABI}
 
         UPDATE_COMMAND ""
         DEPENDS ext_zlib
 )
 else()
     ExternalProject_Add( ext_quazip
         DOWNLOAD_DIR ${EXTERNALS_DOWNLOAD_DIR}
-        URL https://api.github.com/repos/stachenov/quazip/zipball/v0.8.1
-        URL_MD5 948f74e191d8d111e050720763678280
+        URL https://github.com/stachenov/quazip/archive/v0.8.1.tar.gz
+        URL_MD5 0161c679b1d32c289dab2f96c81354aa
         PATCH_COMMAND ${PATCH_COMMAND} -p1 -i ${CMAKE_CURRENT_SOURCE_DIR}/find_quazip.diff
         COMMAND ${PATCH_COMMAND} -p1 -i ${CMAKE_CURRENT_SOURCE_DIR}/liblocation.diff
         INSTALL_DIR ${PREFIX_ext_quazip}
         CMAKE_ARGS -DCMAKE_INSTALL_PREFIX=${PREFIX_ext_quazip} -DCMAKE_BUILD_TYPE=${GLOBAL_BUILD_TYPE} ${GLOBAL_PROFILE}
 
         UPDATE_COMMAND ""
         DEPENDS ext_zlib
     )
 endif()