After you've downloaded the file go to your sharedstash file in the Torchlight 2 folder:<br />

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Go to Documents --> My Games --> Runic Games --> Torchlight 2 --> Save --> (a bunch of number) --> in this folder with a bunch of number as the folder name, is a file called sharedstash, make sure to have a backup of you original sharedstash file incase you have important items in there.<br />

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After making a backup, copy and replace the downloaded sharedstash file, into the folder with the original sharedstash file. (make sure your not in a torchlight 2 game (main menu works when replacing the sharedstash file)