Thats an easy one Cam!
Right on the main screen of dsdl, it says, if your tool displays application missing or corrupt, click here, and it tells you how to fix it.
Basically, open DSDL, click options/legacy connect then set DSDL to the correct COM port that your cable is assigned to.
Then update the tool as you would normally, once the .crom is applied and it reboots, all is well...
Lemme know!