You're using the correct download, don't worry.
Feralheart needs to keeps ads (such as AdFly) up in order to keep the site free.
When Adfly pops up, in the top right corner, it should say "Skip Ad In 5"
Wait five seconds, then press the Skip button in the same spot to skip through the Adfly advertisement, and get to the actual Feralheart download. Anything the Adfly site shows as a download is not FH.