Thanks bro, thats indeed a great visual tutorial. Previously I tried and managed opening 1 & 3 and small locks as they are easy but wasn't able to unlock 2 & 4 as read somewhere on PW that it breaks easily so tried by not successful and didn't forced it.
Now I am clear that the whole setup will have to be moved upwards to remove it and will try it again In Sha Allah...I also have to change the channel rubbers as glass becomes uneven when moving upwards and have to keep it pushed down with hand from one side
Thanks again dear for great help ...