curl下载Respondus LockDown Browser失败但浏览器可正常下载

我在尝试自动化安装Mac版Respondus LockDown Browser时遇到了服务器端限制：通过GUI网页浏览器可正常下载大小为117.8MB的安装包，但使用curl命令从命令行下载时失败，仅得到5KB文件。我尝试修改User-Agent参数，但问题仍未解决。

相关zsh脚本如下：

#!/bin/zsh

# # # # # # # # # # # # # # # # # # # # # # # # # # # # # # # # # # # # # # #
# Download and install Respondus Lockdown Browser from .pkg
# # # # # # # # # # # # # # # # # # # # # # # # # # # # # # # # # # # # # # #
# Define Variables

installerName="RespondusLockdown"
pkgfile="/tmp/$installerName.pkg"
url="https://download.respondus.com/lockdown/download7.php?id=228644488&ostype=2"

# # # # # # # # # # # # # # # # # # # # # # # # # # # # # # # # # # # # # # #
# Define functions

checkResult() {
    error="An error occurred"
    if [[ $? = 0 ]]
    then
        printf "$success"
    else
        printf "$error"
    fi
    printf "\n\n"
}

downloadInstaller() {
    local success="Package downloaded successfully"
    curl -Lo "${pkgfile}" "${url}"
    checkResult
}

installPKG() {
    local success="Package installed successfully"
    installer -pkg "$pkgfile" -target /
    checkResult
}

cleanUp() {
    local success="Package removed successfully"
    rm "$pkgfile"
}

main() {
    downloadInstaller
    installPKG
#   cleanUp
}
# # # # # # # # # # # # # # # # # # # # # # # # # # # # # # # # # # # # # # #
# main

main

exit 0

修改User-Agent的尝试代码：

userAgent="Mozilla/5.0 (Macintosh; Intel Mac OS X 10_15_7) AppleWebKit/605.1.15 (KHTML, like Gecko) Version/15.0 Safari/605.1.15"

curl -A "${userAgent}" -L -o "${pkgfile}" ${url}

内容的提问来源于stack exchange，提问作者user22547243