The wentlands are the game why can't I continue further?..
make sure the version you play is 0_79
there are available:
0_79 paid version
0_79 demo / public version
0_54 free version (i think its the free one)
anyway you could downlod old version of the game
I have just read an comment from jashim that paid version also features new enemies, if thats true and not some translate error then you might need 0_79 paid version for this content