Anscombe's final comments are the beginning point of my discussions of the argument. Anscombe thought that there were flaws in the revised formulation of the argument, she also thought that Lewis asked a question "Even if grounds do exist, what have they got to do with the actual occurrence of belief as a psychological event," to which she said "we haven't got an answer." These are not the words of someone who thinks they have slam-dunked their opponent.
I've often wished that the Anscombe original critique, and the Anscombe final comments. I wrote a brief review of the volume for Amazon. Getting the appropriate permission, in this case, might be difficult. I tried to get a volume together of Lewis-related philosophical essay along with another Lewis scholar, but was not able to pull together such a complex project. One of my plans was to include all the original texts from the Anscombe exchange (though there is a new volume of Lewis essays coming out edited by Walls, Habermas, and Baggett--unfortunately no Anscombe appendix).
As an attempt to show difficulties with Lewis's original argument, the critique works nicely, as Lewis surely admitted. That's a good day's work for a philosopher. If that's all you mean by winning, the Anscombe won. If winning means getting the better of the session at the Socratic, then that's probably right, though reports are mixed. But invariably, "winning" is thought to be a good deal more than that; it is thought to be showing the argument to be fundamentally mistaken and misguided. But in order to hold that Anscombe achieved this, you would have to agree with her that reason-explanations not only can be distinguished between causal explanations, they can be divorced completely, and therefore a "S believes P for reason R" can be answered in a way that leaves completely out of account how the belief is produced and sustained in S. That was popular amongst Wittgensteinians, and I sometimes hear it being defended, but even naturalistic philosophers from Davidson to Dretske to Jaegwon Kim don't want to go that way, and I think (for reasons I give in some detail in my book), they have good reason for so doing.
But yes, I would love to include an appendix to my book with the original documents in it, or make it available online. But it isn't the sort of thing you can include in a monograph without a lot of hassle. I understand that even the Lewis estate can be difficult to deal with for permissions.
Does anyone think that I failed to give an adequate summary of the relevant arguments?
I am linking to the Amazon page on Anscombe's book, which may be out of print but it's still available.