My first dive into the world of shell scripting...

download.sh

#!/bin/bash

# download.sh <dir> <file1> <file2>...

tempDir="$1"

#make folder and cd to it
mkdir $tempDir
cd $tempDir

#make array of arguments
if [ "$#" -eq 0 ]; then
    echo "No arguments provided"
else
    args=( "$@" )
fi

#curl files

for (( i=1; i<=$(( ${#args[@]} * 2 )); i++ ))
do
    if [ ${#args[$i]} -gt 0 ]; then
        curl -O ${args[$i]}
    fi
done