No download link for Adblock Plus
Adblock forums says


  this product is outdated (not maintained anymore), eventually use adblock browser for android


Also, see this post 


  see what said an eyeo moderator:
  "Unfortunately at the moment we have no Android developer, therefore solving real issues is kind of difficult." 


That's probably why all links on the official site are dead. They haven't bothered to update the home page. 

It's not available on F-droid too but alternative stores seem to have it but obviously there won't be any support.