Kiwix JS Windows/Linux is a more fully featured release customized for the following platforms: Electron (Win 7/8/10/11 and Ubuntu / Debian / OpenSUSE, 32bit and 64bit); NWJS (Win XP/Vista/7/8/10/11 32bit and 64bit), UWP (Win 10/11) and an installable PWA. There are portable and self-updating installable versions. The universal PWA version can be used instantly just by visiting https://pwa.kiwix.org (in Chrome and Edge, you can install it as a fully fledged app, see install button on Configuration page). It’s always up to date and works offline after you install it!
Please note these API limitations: the browser extension version requires you to pick the ZIM archive you wish to use each time you open the app (or you can drag-and-drop the ZIM into the extension). The PWA version uses the File System Access API to provide a near-native experience in Chrome/Edge, but this API is not supported by Firefox. The Electron/NWJS and UWP versions have file system access natively.