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1.5.97 SSE should be using SKSE 2.0.17 - 2.0.20. Anything above 2.0.20 is going to give you that error. I personally still use 1.5.97 because I don't want AE and all the BS with it. On https://skse.silverlock.org in the downloads section you should see the line that says "Current Special Edition Build 2.0.20 (game version 1.5.97)" that's the one you want. You also do HAVE to use 7zip to extract the files. There is also a video on Silverlock that give instructions on proper installation of skse64.
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