yes i downloaded and placed into AH folder and selected tnsunia offline but there is no north spawn? How EXacTly do you UnZip a file?
To use the terrain, unzip it, and put the resulting .res file (such as "brooke1.res" or whatever) into your "C:\Program Files\HTC\Aces High II\ahiiterr" folder. Then, start up Aces High, click on "Choose Terrain", pick whatever the name of the .res file was (such as "brooke1"), then choose "Offline Practice".
To unzip in Windows, all you have to do is double click on the .zip folder to open it. Then you can drag the file inside to whatever other location you choose, just like using any folder. You don't need to install WinRAR or any other tool for zip files.