So my problem was to download files from temporary links.
If you consider Combofix, an util to clean Windows from malware, it's a program updated daily and I want always the last version.
But the download link is temporary and always changing, and I don't trust other sites static links.
I developed a system to download a list of links, the main idea is to have the list of links in the page and after I go parsing the list to found the correct temporary links.
It's dirty but it's working.