The latest version is checked online, and we surely don't have an outdated version online, the only possible reason why the installer downloaded an outdated manifest.json, must be related to a problem with your local cloudflare node, which might be stuck into an older version.
Or, it's possible the browser cache is playing tricks on you, even if our installer obviously disables it, but you never know what can happen when networks and downloads are involved.
That's why we have an Offline installer, to cover these strange cases.