There is a problem with the JTAG Tool site being down at the moment, making it impossible for the program to check for the correct updates, its a bug within the program. When you get the update box, just press enter on your keyboard, then you will be able to get into the program.
For some reason I have been having problems with J-Runner too. I do not know why, I just went and did it the old way with the command prompt and NandPro.
I am assuming you are using a USB flasher or a NAND-X to read the image since you are on a laptop.
If that is the case, just open up the command prompt, change to your NandPro directory and type "nandpro usb: -r16 [whatever you want to call your nand].bin"