Is that a trick trying to get you to download the program and never getting to the real file?
Possibly. Some sites have a large download button for whatever crapware they have some kind of advertising deal with, and put the actual download link off to the side or bottom of the page.
Clicking on the download link for the +7 Trainer, I got a popup window with an ad, clicked the 'skip ad' button, and was given a list of mirrors for the mt-x_setup.rar file. I canceled the download, though, as I have the Xbox version of DKS and can not test the trainer.
If you cast a Fire Sphere at a nest as you approach, you will need less Firebreath to take it out. Circling around the nest should also help limit the amount of damage you take, compared to sitting still.
You can use the Dragon Spirit healing spell, a healing potion and a rejuvenation potion in quick succession, if you need to. I had a spare button after re-assigning the dragon skills, so added ultimate healing potions; I rarely needed to use the healing spell.
The Wrath of the Patriarch will take out clusters of enemy structures, so whenever you can try to use it on the densest group you can see in range.