kali-update-script.sh

#!/bin/bash

#Standard update from repos.

apt-get update && apt-get upgrade -y && apt-get dist-upgrade -y

#Update the Exploit Database.

mkdir -p /root/Downloads && cd /root/Downloads 
wget https://github.com/offensive-security/exploit-database/archive/master.zip

echo "Quietly unzipping master.zip..."
unzip -qq master.zip
echo "Done unzipping master.zip"

echo "Syncing downloaded exploit database with /usr/share/exploitdb/..."
rsync -a exploit-database-master/ /usr/share/exploitdb/
echo "Done syncing exploit database"

echo "Removing downloaded exploit database..."
rm -rf master.zip exploit-database-master
echo "Done updating!"

Thanks. Do you want to create a Downloads directory each time? I already have it in root. When you ran the update script, did you see 404 errors from the sources?