I searched for the article again, here (concerning doing this via Steam)…
…but it appears…
…that Valve has walked that back some.
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With that said - doing this via Steam is a fairly complicated procedure. When I did it I followed this guide here:
While this guide is for Skyrim, the same methodology and tools can be applied to GD but, again, it is a bit of a complicated procedure.
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Otherwise, there is also this:
…I’m pretty sure there was also another similar type post as this by someone that had multiple older versions for download but I couldn’t find it.