Hi Sina,
Here’s an English manual in PDF format:
Durst M605 manual.
It might be tricky to get one in German; have a go at asking Durst. They’re quite friendly and always help where they can. Otherwise, there’s always Lindemanns for a possible reprint.
If you have any questions about the machine, feel free to ask. Lots of people (myself included) have an M605 at home.
Best regards,
Franz