i've never heard of any purchase restrictions depending on locations.
is the plugin installable from the UPM?
at least you can download it manually and upload it using the UPM.
later you can purchase the license don't you?
and if you still experience some issues i assume it would be a good choice to contact the vendor directly via Mail
the Atlassian Marketplace is not available within all countries round the world, although the Atlassian team is heavily involved to extend this country by country. You can find a list of support countries here: http://www.atlassian.com/licensing/marketplace#generalmarketplacequestions-11
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