I'm here to confirm that the unpacked version doesn't run on Linux. I bought it just to support the creator, but it'd be neat to have an offline version. I'm like 99% sure that this is an Electron tool, which means that it should be (comparatively) easy to build a Linux version.
If you have no interest in it, that's fine. I'm just reporting that, if you do, at a minimum one person would use it.