> How would one limit a free offer to a certain country? You could choose a country with a unique language and limit the free version to that language. Though

> How would one limit a free offer to a certain country? You could choose a country with a unique language and limit the free version to that language. Though I'd question a limitation to a single country itself. Cultural aspects do matter, and by doing so you pin down two variables at once, so the results are much harder to interpret.