Alesis has just released a product update for the DM5. Here it is as stated by Alesis:

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Free new sound set for the DM5

Download the new sound set for your DM5 that’s optimized for use with the DM5 Pro Kit pads. Click here and select the Docs & Downloads tab.

All you need is a MIDI interface (such as the iO|2) and freeware such as MIDIOX (PC) or SysEx Librarian (Mac) to make the transfer.