Well actually you shouldn't need anything extra to move stuff from one SD card to another via computer. No bells and whistles or extra programs. It is extremely simple.
You just have to leave the SD card in its device, connect the device to the computer via USB and move or copy the contents of the card, while in the device, over to a folder on the computer (just create a folder for this only).
Once it is on the computer, you just need to do the same with the card you want to put the data on. Make sure it is in its device, connect the device to the computer via USB and copy the data over to the new card in the device.
Nothing else needed.