The NZ Open GPS Project is primarily about up to date street maps. They are updated weekly.
You CAN get older versions of Mr Purple's topo maps from that forum, but they're a few years old now, and there's more fuck-around factor involved in installing them. He stopped giving them out free at about version 12. He's selling version 17 now. They are only updated every few months at best, partly because the underlying topo data doesn't change often, and partly because it takes yonks to recompile the maps.
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