After Map Render, it is all underwater! Map Height Plugins

[Tekee 0]

So I'm trying to make Saint Petersburg, and I render the map, but after rendering the whole region is underwater! 

 

The only part I don't understand is the Height Plugin. THe link is broken in the description, but I found this which claims to have MallowtheCloud 's original files = 

 

Now... what the heck do I do with them??? 

I put them directly into my Plugins folder.. am I supposed to make a special subfolder in the plugins folder? and what are all these files : 100m.dat, 200m.dat etc.

 

Just please... Tell me how to prevent my region renders from being UNDERWATER! (((