I downloaded a piece of 21-days trail primium software from a vendor for evaluation. They offer a set of free add-ons as part of the download. Unfortunately they only let me pick one of the several free add-ons to try. The download URL is in the form of something like: company/download-location/etc/free_add_on_addon_type... So how hard is it to guess all the download names? Not hard. I got them all first try. Since these are free add-ons anyway I don't feel too bad about figuring this out and downloaded all their free add-ons. After all I may end up buying this piece of expensive software.

One look at the URL for the download however,