hi saqib
welcome to IRTS MSTS WORLD OF INDIAN RAILWAYS and enjoy your stay here throughout.Regarding the GREAT INDIAN RAILWAYS DEMO ROUTE DOWNLOAD,its available for download in the routes section right at the bottom the download link is provided and the size is 16.3 mb and its a full file and i don't understand why you find difficulty in downloading it,please try again maybe your connection mite be experiencing difficulties and even then if you encounter problems feel free to post here your queries regarding it.
thanks