Update 16:00: The disruption is gone now.
Original post from July 15th 2021:
short note: Due to changes in our DNS structure an IPv6 address that does not belong there got stuck in the entries.
As a result, downloads and some other bot services are currently unavailable because our API server cannot be accessed correctly.
As an alternative that you can take instead of the download page at the moment, you can use the respective direct link to the version: https://download.mfbot.de/v220.127.116.11/MFBot.exe.
The problems should be solved as soon as the DNS update has arrived everywhere, but this can still take between 4 and 16 hours.
Thank you for your patience!