Not only was I able to correct my post in the above referenced thread, but I was also able to edit the first post in this thread - something that I wasn't able to do earlier.
You're quite welcome. If the SetupGU16GMRS.exe file is working for you, that's great. Back in the day (two years ago), it was the officially-distributed software for programming the GMRS version of the GU-16.
As to how I located it, that was easy.
Since I've done more than a few Web sites for people over the years, I know basic X/HTML, CSS, and JavaScript, and needless to say, I've examined the source code of many a Web page that was created by persons other than myself. Because of this, I'm very aware that some Webmasters have a habit of leaving old code in their pages when they update the page. So in this case, I looked at the code for the page at http://www.powerwerx.com/wouxun/usb.html and saw that it still contained references to both the Commercial and GMRS versions of the GU-16 radio, even though the code in question was no longer being rendered by the browser and therefore wasn't visible to a visitor to the page.
If you do a 'View Source' in your browser (all Desktop browsers and some Mobile browsers have a View Source function) for that particular URL and then do a 'Find' operation for "GU-16" (without the quotes, of course), you'll see what I'm referring to.
And here's some additional information about the GU-16 that I came across after I replied to your post. The Internet Archive's Wayback Machine can sometimes be a highly useful source of information.
The GU-16 (GMRS version) is CE & FCC Part 95 certified, FCC ID: WVTWOUXUN08
GU-16 (GMRS version) product information archived July 4, 2013: https://web.archive.org/web/20130704150520/http://www.powerwerx.com/two-way-radios/handheld-wouxun-radios/powerwerx-gu-16-gmrs-handheld-radio.html
The GU-16 (Commercial version) is CE & FCC Part 90 2013 Narrowband Certified, FCC ID: WVTWOUXUN03
GU-16 (Commercial version) product information archived October 19, 2013: https://web.archive.org/web/20131019024105/http://www.powerwerx.com/two-way-radios/handheld-wouxun-radios/gu-16-single-band-uhf-commercial.html
FrankNY's post in Can't edit my post was marked as the answer