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It should just come right on. It's possible that the libraries have changed a little since I wrote the code, so you should look at that and see if there's any other steps they've added.
Looks like you can still get it here: https://shop.pimoroni.com/products/retro-4-digit-led-display
Also you can find it on ebay search for qdsp6064
simple user-adjustable DIY Nixie Clock
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