You need a 2gb SD card, SDHC will not work. Format the SD card as FAT not FAT32.
Copy everything from your Destinator SD card onto your 2gb card.
Delete everything from your DestinatorApps/Destinator file folder.
Copy all of your iGo files into DestinatorApps/Destinator file folder.
Rename the iGo8 executable (application) as Destinator.
This method will leave the file structure intact. The Omni looks for DestinatorApps/Destinator/Destinator.exe.
You can do the same with Amigo or Primo.