O zippi il file e fai il link al .ZIP, oppure utilizzi una sorta di script detto download manager.

Ti posso consigliare questo molto semplice:

Download Manager v1.0

A very simple download manager. It supports, logging file downloads on both MySql database and flat file. If you don't have MySql server, then no problem. Use this script's "no mysql" option. Then the script logs all download info into a flat file. The script supports, saving your files to download without your knowledge and logging downloader's real ip (even they use proxy), dowloaded script id, download date and time.

Release: 22/05/2001 - Price: Free (GPL) - Platform(s): Win / Linux

http://www.tunga.com/php/download.php?id=2