I am getting an error when trying to update the firmware with the J-Link Tool. “Make sure Version.txt is located at c:\InstallBestcodeImage\ before running the Installer again. What does this mean?

This happens because the folder InstallBestcodeImage has been installed in a directory other than the root C:\

Check the location of this folder and if it is located anywhere other than C:\ then move the folder to the root directory so it is located at c:\InstallBestcodeImage\

Once this is done it should operate fine and the J-Link can be used to update firmware.