Failed to launch Tor Browser: Server provided a downgrade: '7.0a3'

Less than ten hours ago, I was still able to execute sandboxed-tor-browser, and it would run as expected.

When I now try the same, I get a popup window with this error message: "Failed to launch Tor Browser: Server provided a downgrade: '7.0a3'"

The installed version is 7.0a2, so it seems the launcher/updater fails to parse the version number correctly.

Trac:
Username: Digitalcourage