take "RTMP Server - rtmpsuck.exe" not "RTMP Proxy Server ..." under "Options/RTMODumpOptions" - this was my problem getting only files smaller than 50 min.
Re: Problems with RTMPDumpHelper
Nikita Turing. Send me a mail, if you want to.
Just unpack the archive, enter the Path to rtmpdump and start downloading!
Just copy the arte+7-Url to a702 and start "download".