http://en.savefrom.net/user.php?vid=307&utm_source=savefrom&utm_medium=vidacha&utm_campaign=sf_helper&utm_content=youtube_rekomenduem-ustanovit-sf-pomoshnik

you have download a youtube and vemino vedio without internet download manager
for eg:- play vedio and in the adress bar
 you have cut the first  two words (https://www.) and write the two words (ss) 
like that (ssyoutube.com/results?search_query=vedio+game+level+animation+reel+)
 
you have seen  5 and 6 types of formet for downloading youtube vedio