If you are in the UK and are missing Windows Media Center guide data beyond September 6th it’s not just you is Microsoft. In what seems to be an annual problem guide data isn’t downloading to Windows Media Center systems. 11 months ago Windows Media Center had exactly the same problem with Microsoft fixing just as the EPG data ran out so hopefully they get the issue resolved quickly as A DVR without an EPG is pretty useless. I don’t think it’s a conspiracy to get Media Center users off Windows 8 and on to Windows 10!
You can vote up the issue on Microsoft’s Connect site.