I was first unable to import with either 14.4 or 14.7 when I created a project with Zynq/xc7z020/cg484/-1. I then created a dummy project with Virtex 7, so that I could import and open the IP to see the exact configuration options.
After that, I tried to generate. I created a new project in 14.4 with Zynq/xc7z020/cg484/-1. When I tried to generate in this new project using the dsp48 IP, I was unable to set the bitwidth of the D input. It was set to 18 and grayed out. I could set the bitwidth of the others to 16. I don't know why this happened.
In any case, thanks for this xco file. I will use it instead.