Go to his/her piapro:[link]
Under the picture, there are 3 buttons: click on the middle (the one which a green arrow)
Now, you download content.x : you only need to rewrite the file name: delete the ".x" and put ".rar" or ".zip"
Now extract as usual ^^
Hope it was helpful
IF YOU CAN'T DOWNLOAD THE MODEL FROM PIAPRO, IT'S BECAUSE YOU NEED TO LOGIN IN PIAPRO: YOU NEED A PIAPRO ACCOUNT.
TUTORIAL FOR CREATE A PIAPRO ACCOUNT:[link]