try update the package to download the software
diff --git a/build/appveyor/MING-appveyor-install.bat b/build/appveyor/MING-appveyor-install.bat
index 31b9bd7..d06e030 100644
--- a/build/appveyor/MING-appveyor-install.bat
+++ b/build/appveyor/MING-appveyor-install.bat
@@ -51,5 +51,6 @@
:: %BASH% -lc "pacman --noconfirm -Syu %IGNORE%" || EXIT /B
:: %BASH% -lc "pacman --noconfirm -Su %IGNORE%" || EXIT /B
::
+%BASH% -lc "pacman -Scc" || EXIT /B
+%BASH% -lc "pacman -Syyu" || EXIT /B
%BASH% -lc "pacman --noconfirm %PACKAGES%" || EXIT /B
-%BASH% -lc "wget http://repo.msys2.org/mingw/x86_64/%BOOSTPKG% && pacman -- noconfirm --needed -U %BOOSTPKG% && rm %BOOKSTPKG%" || EXIT /B