This is the second extension I purchased from this developer, and once again, it's worth every single penny. When I had trouble, he never hesitated to help out. And for Giang and anyone on a Mac having troubles... I figured it out! If you're saving a csv from Excel for Mac, choose "windows csv" as your file type, not just regular csv. That's what was throwing me off. :-)
You won't regret buying this. It works perfectly and comes with THE BEST customer service. Hands down.