1.7.1 is an update for only windows 10 and Xbox one, so 1.7.0 worlds should work and import worlds from this version, I can download the pack on win 10 so there is nothing wrong with the world, my device has lots of free storage so it can only be a game bug. Here is the link to the world I was trying to download:
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Sorry, we cannot help you with content you obtained from somewhere other than Mojang. The .mcworld file you're trying to play may be incompatible with 1.7.0 because the world was modified using third-party tools.
If you can recreate this problem with a world that you know was never modified at any time by a third-party tool, feel free to create a new ticket to report it. (Please remember to search for a duplicate report first, however.)
Sorry, we cannot help you with content you obtained from somewhere other than Mojang. The .mcworld file you're trying to play may be incompatible with 1.7.0 because the world was modified using third-party tools.
If you can recreate this problem with a world that you know was never modified at any time by a third-party tool, feel free to create a new ticket to report it. (Please remember to search for a duplicate report first, however.)