Marketpress Groupon Coupon batch import

Hi

I would like import a large number of coupon codes. This post – https://wpmudev.com/forums/topic/marketpress-batch-import-of-coupon-codes – is exactly what I am looking for however I can’t get it to work at all. Marketpress has been updated since this posting however so I wonder if something has changed in the interim,,,

In any case, how can I import a large number of coupon codes all at once? Several hundred of them at least….