See the official Maltego documentation.
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Ensure you have Python3 and pip installed.
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pip3 install -r requirements.txt
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Open Maltego (CE will be enough)
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Click "New local transform..." button
- Fill in the fields in the first window (example below), press Next
- Fill in the fields in the second window (example below), press Finish
- Create an Alias with desired username and choose transformation
- That's all!