diff --git a/external_deps/build.sh b/external_deps/build.sh
index b50e81abf4..7255f5340f 100755
--- a/external_deps/build.sh
+++ b/external_deps/build.sh
@@ -97,7 +97,7 @@ extract() {
 		tar xzf "${archive_file}" -C "${extract_dir}"
 		;;
 	*.zip)
-		unzip -d "${extract_dir}" "${archive_file}"
+		unzip -q -d "${extract_dir}" "${archive_file}"
 		;;
 	*.cygtar.bz2)
 		# Some Windows NaCl SDK packages have incorrect symlinks, so use
@@ -1681,9 +1681,6 @@ then
 	syntaxError 'Missing package(s)'
 fi
 
-# Do not reuse self-built curl from external_deps custom PATH
-# to download source archives or we would get errors like:
-#   curl: (1) Protocol "https" not supported or disabled in libcurl
 CURL="$(command -v curl)" || log ERROR "Command 'curl' not found"
 
 # Enable parallel build
diff --git a/external_deps/sdk-build.sh b/external_deps/sdk-build.sh
index 4574b347c7..bfe36bf552 100755
--- a/external_deps/sdk-build.sh
+++ b/external_deps/sdk-build.sh
@@ -13,7 +13,7 @@ eval "${versions_out}"
 
 REPO_BASENAME=saigo-nacl-sdk
 REPO_URL="https://github.com/DaemonEngine/${REPO_BASENAME}"
-ARCHIVE_PATH="${DOWNLOAD_DIR}/saigosdk-${SAIGOSDK_REF}.tar.gz"
+SRC_ARCHIVE_NAME="saigosdk-${SAIGOSDK_REF}.tar.gz"
 
 usage() {
 	cat <<-EOF
@@ -24,6 +24,7 @@ usage() {
 	  build - build all tools and libraries in the SDK
 	  install - install final build products to ${WORK_DIR}/saigosdk-<os>-<arch>_${SAIGOSDK_VERSION}/
 	  wipe - delete build products (except download cache) AND install directory
+	  download - download a pre-built SDK
 	If you want to build only a subset of packages, prefer using the
 	${REPO_URL} CMake build directly.
 	Some global configuration options are available via environment
@@ -32,9 +33,11 @@ usage() {
 }
 
 download() {
-	test -f "${ARCHIVE_PATH}" && return
+	local archive_name="$1"
+	local url="$2"
+	test -f "${DOWNLOAD_DIR}/${archive_name}" && return
 	mkdir -p "${DOWNLOAD_DIR}"
-	curl --fail -L "${DOWNLOAD_URL}" -o "${ARCHIVE_PATH}"
+	curl --fail -L "${url}" -o "${DOWNLOAD_DIR}/${archive_name}"
 }
 
 if [ "$#" -lt 2 ]
@@ -48,13 +51,13 @@ shift
 
 if grep -q -E '^[0-9a-f]{40}$' <<< "${SAIGOSDK_REF}"
 then
-	DOWNLOAD_URL="https://github.com/DaemonEngine/saigo-nacl-sdk/archive/${SAIGOSDK_REF}.tar.gz"
+	SRC_DOWNLOAD_URL="https://github.com/DaemonEngine/saigo-nacl-sdk/archive/${SAIGOSDK_REF}.tar.gz"
 	TARBALL_OUTER_DIR="${REPO_BASENAME}-${SAIGOSDK_REF}"
 elif grep -q -E '^v[0-9]' <<< "${SAIGOSDK_REF}"
 then
 	# The 'v' from the tag name is mysteriously removed???
 	TARBALL_OUTER_DIR="${REPO_BASENAME}-${SAIGOSDK_REF:1}"
-	DOWNLOAD_URL="https://github.com/DaemonEngine/saigo-nacl-sdk/archive/refs/tags/${SAIGOSDK_REF}.tar.gz"
+	SRC_DOWNLOAD_URL="https://github.com/DaemonEngine/saigo-nacl-sdk/archive/refs/tags/${SAIGOSDK_REF}.tar.gz"
 fi
 
 INSTALL_DIR="${WORK_DIR}/saigosdk-${PLATFORM}_${SAIGOSDK_VERSION}"
@@ -65,9 +68,9 @@ for target in "$@"
 do
 	case "${target}" in
 	build)
-		download
+		download "${SRC_ARCHIVE_NAME}" "${SRC_DOWNLOAD_URL}"
 		mkdir -p "${BUILD_DIR}"
-		tar xzf "${ARCHIVE_PATH}" -C "${BUILD_DIR}"
+		tar xzf "${DOWNLOAD_DIR}/${SRC_ARCHIVE_NAME}" -C "${BUILD_DIR}"
 		(
 			cd "${REPO_DIR}"
 			tools/release/build "${PLATFORM}"
@@ -79,6 +82,12 @@ do
 	wipe)
 		rm -rf "${BUILD_DIR}" "${INSTALL_DIR}"
 		;;
+	download)
+		BIN_ARCHIVE_NAME="saigosdk-${PLATFORM}_${SAIGOSDK_VERSION}.tar.xz"
+		download "${BIN_ARCHIVE_NAME}" \
+			"https://github.com/DaemonEngine/saigo-nacl-sdk/releases/download/v${SAIGOSDK_VERSION}/${BIN_ARCHIVE_NAME}"
+		tar xJf "${DOWNLOAD_DIR}/${BIN_ARCHIVE_NAME}" -C "${WORK_DIR}"
+		;;
 	*)
 		usage
 		exit 1