You could always force them to enter which build they're using, and then warn them that they're not likely to get support if they're using an old development version, or an old stable. Of course, you'd probably have to make them write it in a certain way, or possibly use something like a checkbox for whether it's a stable or not, followed by a few dropdowns for which version, with a reminder that you can see which version it is on the titlebar.
in a perfect world we would all be piles of sand with no ability to form coherent bodies of body