It turns out that was actually an oversight on my part. The .mozconfig I used to build it didn't include the redistributable files with the application, which is supposed to prevent situations like the one you encountered. A lot of applications on Windows 10 or later are now built with newer Visual Studio, which means I would never have seen this issue.
Would you be willing to test it out with an account or two without making it your primary application you rely on? I do need people to test it, but I really want them to use something else as a fallback so that they aren't in the position of needing it to work for mission-critical situations and having to rely entirely on me for support.
I did take your feedback about struggling to extract the archive into consideration, though. Future builds will likely be distributed as .zip files... the decision to distribute them as .7z wasn't mine anyway, the platform just got setup to do that and I didn't think to question it.