Please make sure this is being uninstalled and re-installed as administrator. If you have multiple accounts on your computer operating system, please make sure that you are logged in as an administrator. And
please uninstall any past installations of the Obsidian Launcher or any sort or type or version whatsoever as the administrator and re-install it as administrator from here:
http://www.saberforum.com/index.php?topic=11988.0 (this is always the latest version of the Launcher).
Turn your lightsaber ON first. Then plug the USB cable into the computer then the saber while the saber is ON.
Then run the program and when you run the program please right click it and select "Run as administrator"
Then when you go to upload the soundfont please make sure that you fill each soundbank (boot, power on, power off, etc) yourself, do not leave whatever was in there, even if you are putting the same font in its place be sure that you manually fill each and every bank yourself and then see if it allow you to download the soundfont onto the soundboard.