please don't judge my code...
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Download and unzip into an empty folder
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Run
backend.exeand open http://localhost:7890 -
Click
Addand add as many IDs as you want -
When you're done, click
Fetch all- all regions are cached locally, so you don't have to re-download them every time
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Go to Nominatim
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Find a region, open its details and copy the ID (it should start with
R)