But are you marketing it towards corporations and their IT departments or are you expecting individuals to find it and pay for it themselves? The reason I ask is because the selling of desktop software isn't nearly the neat problem selling of mobile software is. There's been considerable discussions in the forums about how to do it and no really good answers have arisen out of those discussions. Erel sells desktop software and he faces all the same obstacles we do: where to host the downloads, how to attract an audience, etc...
Itch.io seems to be a rising force in cross-platform software selling but they are mostly geared towards games. I doubt it would help in your case.
Another strategy is to have a mobile version or mobile component that is hosted on, say, the Google Play Store and then have a link to a download of the desktop version/component listed in the description in your Google Play listing. You'd have to figure out how to host the desktop download, of course.