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You can get the Python Bridge server as part of Saga deliverables which are stored in the Saga&ESUI teams site here. At the time of writing the latest version of Saga availabe available is 1.3.1.1  

Installing Python

The current version of Python Bridge where developed and tested using Python 3.9.5, but any Python 3.9.x version will suffice. At the moment of writing this guide the released version of 3.9 is Python 3.9.5 which you can download from here Python Release Python 3.9.5 | Python.org, please remember to download the 64-bit version of Python, some libraries are no compatible with the 32-bit version and will not work.

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