I did it
For those with same problems
RTMPDumpHelper is software you need, also download RTMPDump and extract in same folder where RTMPDumpHelper is
Now run RTMPDumpHelper and in options choose folder where you want download videos, go to page where is stream and run video
rtmpsuck will run automaticaly in cmd, wait for stream video to end and you will find video file downloaded in folder you choose