Yeah demo is not working for me too. I saw someone brought it up like weeks ago. Surprised it's still not fixed

Still not working ????

Sorry about that. The demo server keeps crashing. We believe the hard drive of that server is failing.

We have rebooted it, so it works again.

We have also already ordered a brand new server to replace it but we were not able to make the switch as we were busy with releasing b2evolution v6.6.6 (which came out today).

that version number :d
@fplanque wrote earlier:

b2evolution v6.6.6 (which came out today).

Note: the demo site is fixed now (complete new VPS and new setup).

Also: forensics confirm the issue was with the hard drive.