A user report on the forum says that the Scalable Vector Graphics (svg) importer "doesn't work" on SVG exported from Adobe Illustrator CC. He supplied a test file, which I simplified a bit here:
I find that the importer works, but that the scale is about 10,000 too small.
I note that removing the "viewbox" attribute from the svg node in the example file results in an imported size that looks about right. But I hesitate to remove or disable the viewbox processing code in addons/io_curve_svg/import_svg.py as I am not familiar with how the code is doing its scaling.
Reference: the forum post: