Step 2
Naviagte to your My Documents --> Bioware --> Mass Effect 2 --> Save folder.

Step 3
Create a new folder.

Step 4
Rename this folder to the same thing as one of your other folders, but just change a number at the end.

Step 5
Drop your downloaded save into this folder.

Step 6
Load up Mass Effect 2. Select "New Game" then "Import ME2 Character. (You can also load the new save by choosing "Load Game" and "Show all".

Step 7
Select your new Shepard and choose to start a new game!