My 2 cents: I started the SWS-Installer (latest pre 64bit) to look what it does, and it wants to install it here: "C:\Program Files\REAPER (x64)" by default. I just installed it without changing anything.
I then looked in that folder and it is in: "C:\Program Files\REAPER (x64)\Plugins\reaper_sws64.dll".
HTH
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