The only SSIM available, so far, is Shiandow's version in this plugin:
https://forum.doom9.org/showthread.php?t=172698
You need that plugin, the avsi, and the shader pack installed somewhere that AVS+ can find it.
Madshi has yet to release his version.
Quote:
~source
ResizeShader(width=1280, height=692, kernel="SSim")
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