Hello.
PHP Ninja here. Can help you out, but I need explanation first.
Exactly what does "3-intructions to install the script on my server." mean ?
As far as I understand, I need to write a script that:
1. Downloads a file specified URL.
2. Saves it to specified place.
3. Sends an email telling how did the operation go.
4 . ???
Do we have CRON tasks available on our server?
Let me know,
Vilius Sutkus'89