have some bad people abusing the site
I tried this:
<IfModule mod_limitipconn.c>
<Location /my_download_directory>
MaxConnPerIP 3
</Location>
</IfModule>
but the module is not available. is there something else available?
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On a shared server there are not many options...
Have you tried putting a CAPTCHA on the download page?
Tracking visitors with cookies, EverCookies or a Session code passed in the URL?
Where are the abusers coming from? can you block them by IP range ?
Is it one person using a scraper script or many humans? take a look at the referer values & UserAgent strings in the raw access logs this will tell you the kind of PC visiting your website.
Do you automatically change the download link locations using a random element every hour?
this stops people sharing links and forces them to visit the website
Are you sure it is not a search engine from Google, Bing or Yahoo ? they operate from well known IP ranges and can be controlled by either your robots.txt file or by setting up your webmaster account with them to get a custom crawl rate.