Something download fail in Appveyor CI test.

Total Download Size:    50.05 MiB
Total Installed Size:  492.44 MiB
:: Proceed with installation? [Y/n] warning: no /var/cache/pacman/pkg/ cache exists, creating...
:: Retrieving packages...
error: failed retrieving file 'mingw-w64-x86_64-icu-64.2-1-any.pkg.tar.xz' from repo.msys2.org : The requested URL returned error: 404
error: failed retrieving file 'mingw-w64-x86_64-icu-64.2-1-any.pkg.tar.xz' from sourceforge.net : The requested URL returned error: 404
downloading mingw-w64-x86_64-icu-64.2-1-any.pkg.tar.xz...
error: failed retrieving file 'mingw-w64-x86_64-boost-1.70.0-2-any.pkg.tar.xz' from repo.msys2.org : The requested URL returned error: 404
error: failed retrieving file 'mingw-w64-x86_64-boost-1.70.0-2-any.pkg.tar.xz' from sourceforge.net : The requested URL returned error: 404
downloading mingw-w64-x86_64-boost-1.70.0-2-any.pkg.tar.xz...
downloading mingw-w64-x86_64-c-ares-1.15.0-1-any.pkg.tar.xz...
error: failed retrieving file 'mingw-w64-x86_64-brotli-1.0.7-1-any.pkg.tar.xz' from repo.msys2.org : Operation too slow. Less than 1 bytes/sec transferred the last 10 seconds
error: failed retrieving file 'mingw-w64-x86_64-brotli-1.0.7-1-any.pkg.tar.xz' from sourceforge.net : The requested URL returned error: 404
downloading mingw-w64-x86_64-brotli-1.0.7-1-any.pkg.tar.xz...
downloading mingw-w64-x86_64-libunistring-0.9.10-1-any.pkg.tar.xz...
downloading mingw-w64-x86_64-libidn2-2.2.0-1-any.pkg.tar.xz...
downloading mingw-w64-x86_64-libmetalink-0.1.3-3-any.pkg.tar.xz...
error: failed retrieving file 'mingw-w64-x86_64-libpsl-0.21.0-1-any.pkg.tar.xz' from repo.msys2.org : The requested URL returned error: 404
error: failed retrieving file 'mingw-w64-x86_64-libpsl-0.21.0-1-any.pkg.tar.xz' from sourceforge.net : Maximum file size exceeded
downloading mingw-w64-x86_64-libpsl-0.21.0-1-any.pkg.tar.xz...
downloading mingw-w64-x86_64-libssh2-1.9.0-1-any.pkg.tar.xz...
downloading mingw-w64-x86_64-jansson-2.12-1-any.pkg.tar.xz...
error: failed retrieving file 'mingw-w64-x86_64-jemalloc-5.2.0-1-any.pkg.tar.xz' from repo.msys2.org : The requested URL returned error: 404
error: failed retrieving file 'mingw-w64-x86_64-jemalloc-5.2.0-1-any.pkg.tar.xz' from sourceforge.net : The requested URL returned error: 404
downloading mingw-w64-x86_64-jemalloc-5.2.0-1-any.pkg.tar.xz...
error: failed retrieving file 'mingw-w64-x86_64-nghttp2-1.39.1-1-any.pkg.tar.xz' from repo.msys2.org : The requested URL returned error: 404
error: failed retrieving file 'mingw-w64-x86_64-nghttp2-1.39.1-1-any.pkg.tar.xz' from sourceforge.net : The requested URL returned error: 404
downloading mingw-w64-x86_64-nghttp2-1.39.1-1-any.pkg.tar.xz...
error: failed retrieving file 'mingw-w64-x86_64-curl-7.65.3-1-any.pkg.tar.xz' from repo.msys2.org : The requested URL returned error: 404
error: failed retrieving file 'mingw-w64-x86_64-curl-7.65.3-1-any.pkg.tar.xz' from sourceforge.net : The requested URL returned error: 404
downloading mingw-w64-x86_64-curl-7.65.3-1-any.pkg.tar.xz...
error: failed retrieving file 'mingw-w64-x86_64-jsoncpp-1.9.1-1-any.pkg.tar.xz' from repo.msys2.org : The requested URL returned error: 404
error: failed retrieving file 'mingw-w64-x86_64-jsoncpp-1.9.1-1-any.pkg.tar.xz' from sourceforge.net : The requested URL returned error: 404
downloading mingw-w64-x86_64-jsoncpp-1.9.1-1-any.pkg.tar.xz...
error: failed retrieving file 'mingw-w64-x86_64-lz4-1.9.1-1-any.pkg.tar.xz' from repo.msys2.org : The requested URL returned error: 404
error: failed retrieving file 'mingw-w64-x86_64-lz4-1.9.1-1-any.pkg.tar.xz' from sourceforge.net : The requested URL returned error: 404
downloading mingw-w64-x86_64-lz4-1.9.1-1-any.pkg.tar.xz...
downloading mingw-w64-x86_64-lzo2-2.10-1-any.pkg.tar.xz...
downloading mingw-w64-x86_64-nettle-3.5.1-1-any.pkg.tar.xz...
error: failed retrieving file 'mingw-w64-x86_64-zstd-1.4.1-1-any.pkg.tar.xz' from repo.msys2.org : The requested URL returned error: 404
error: failed retrieving file 'mingw-w64-x86_64-zstd-1.4.1-1-any.pkg.tar.xz' from sourceforge.net : The requested URL returned error: 404
downloading mingw-w64-x86_64-zstd-1.4.1-1-any.pkg.tar.xz...
error: failed retrieving file 'mingw-w64-x86_64-libarchive-3.4.0-2-any.pkg.tar.xz' from repo.msys2.org : The requested URL returned error: 404
error: failed retrieving file 'mingw-w64-x86_64-libarchive-3.4.0-2-any.pkg.tar.xz' from sourceforge.net : The requested URL returned error: 404
downloading mingw-w64-x86_64-libarchive-3.4.0-2-any.pkg.tar.xz...
error: failed retrieving file 'mingw-w64-x86_64-libuv-1.30.1-1-any.pkg.tar.xz' from repo.msys2.org : The requested URL returned error: 404
error: failed retrieving file 'mingw-w64-x86_64-libuv-1.30.1-1-any.pkg.tar.xz' from sourceforge.net : The requested URL returned error: 404
downloading mingw-w64-x86_64-libuv-1.30.1-1-any.pkg.tar.xz...
error: failed retrieving file 'mingw-w64-x86_64-rhash-1.3.8-1-any.pkg.tar.xz' from repo.msys2.org : The requested URL returned error: 404
error: failed retrieving file 'mingw-w64-x86_64-rhash-1.3.8-1-any.pkg.tar.xz' from sourceforge.net : The requested URL returned error: 404
downloading mingw-w64-x86_64-rhash-1.3.8-1-any.pkg.tar.xz...
error: failed retrieving file 'mingw-w64-x86_64-cmake-3.15.0-1-any.pkg.tar.xz' from repo.msys2.org : The requested URL returned error: 404
error: failed retrieving file 'mingw-w64-x86_64-cmake-3.15.0-1-any.pkg.tar.xz' from sourceforge.net : The requested URL returned error: 404
downloading mingw-w64-x86_64-cmake-3.15.0-1-any.pkg.tar.xz...
error: failed retrieving file 'mingw-w64-x86_64-libevent-2.1.10-1-any.pkg.tar.xz' from repo.msys2.org : The requested URL returned error: 404
error: failed retrieving file 'mingw-w64-x86_64-libevent-2.1.10-1-any.pkg.tar.xz' from sourceforge.net : The requested URL returned error: 404
downloading mingw-w64-x86_64-libevent-2.1.10-1-any.pkg.tar.xz..