I've gotten errors when I attempted to use Inkscape, GIMP, and Uniconverter because I don't have access to the proprietary software. Perhaps the file corrupt? Thanks for any advice, this is a charitable cause ("Feed my Starving Children") if that is extra motivation for you!
I was able to successfully convert the file to PDF using this online tool and it retained the vector graphics.
I was then able to successfully open that PDF in Inkscape and edit as paths.
Unfortunately I didn't have the font that it uses on the bottom but it's Myriad Pro so not hard to find and you may have it already :)