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Download latest release from https://github.com/almenjonatan/terraforming-mars-overlay/releases (assets)
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Add overlay.dll into \Terraforming Mars\Mods folder
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Unpack overlay.zip at a location you see fit
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Start Frontend.exe which should be located in the unzipped folder, when prompted add an exception to windows defender
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Navigate to http://localhost:5000/player/YourTerraformingMarsId (Asmodee Site), it should state that it's waiting for player
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Start an online game.
If you do not trust the prebuilt version you can build it yourselves from source with
dotnet publish -r win-x64 -p:PublishSingleFile=true --self-contained true