Never mind this post if you don't feel for helping. I saw that Lines in analysis still work even though you are out of free ones. So I found the M4 with computers help.
Treat this as a M4 puzzle if you want! 
But I have found the line
M4 Help me find it
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Hi could you guys help me find M4. I have tried too look but I am only 900+ recently and out of free analysis for today. Thought I might try this forum for help also first time.
I won the game after a longer endgame however if I would have found M4 that would have been better!