Beta8 has broken output redirect, so won't be properly logging to the traditional file, and will have a popup complaining about this when you exit. I'll put out beta9 shortly to address this.
NB: I've not updated the appcast file yet (that's the file that tells running EDMarketConnector.exe processes there's a new version). Please install manually and report any issues. If we get no reports of issues I'll update the appcast file later today.