We love Amy's sweaters published in other locations, and strongly encourage you to use CustomFit to make them! For patterns published in Knit to Flatter, Knit Wear Love, or another knitting publication, there is an issue of copyright. For a time, the publishers keep the publication rights to Amy's patterns, and this means we can't publish them directly into the CustomFit like we have with some of Amy's other patterns.
But that's okay! You can still make one of Amy's non-CustomFit patterns using CustomFit. Amy wrote a blog post recently about how to "mash up" a traditional pattern with CustomFit. There are four simple steps and a worksheet to help you keep track of them at that link.