Ok guys really ? Instead of helping you just point him to threads that have dozens of pages or write long rants ?

Here is what you need to do

1. Download the dictionaries from the link that is given in the app, try Google search on your PC
2. When you have desired archives just use WinRar to decompress them into separate folders
3. On N900 there is a MyDocs folder , that's the one that opens when you use file manager. Create a folder named mstardict
5. Copy each folder via mass storage mode to that folder
6. Viola it works