I just double checked, cause after I got done replying, it occurred to me that I thought I'd seen an option like this on the site before... If you do want to save a whole story from AC without copying/pasting chapter by chapter or getting the file from the author, there is a print option - click the printer icon next to the reviews on the table of contents of the story. It will open up a new tab and a box to print... just wait, and all of the chapters will load in the new page. You can just copy/paste from there without having to print.
I'll still send my Word doc if you or anyone wants it, though; AC may not load 150 chapters as quickly as it did the 11 chapters of the one I just tried it for LOL.