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Are there any new assets? The update for users who purchased earlier requires to purchase one more time? Can't get it, now if I'd go to the page with my purchase from 8 March 2017 all the assets are as "404 error".

If you've logged-in to the same account you used to originally purchase the package you won't need to buy again and it should show a download link right on this page, otherwise on this page:

This does include some new and updated assets.