How to have access to download previous versions of Results Viewer?

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This is obviously unsupported, but you can grab older OpenStudio installers from here, run the installer, and only select Results Viewer from the list of install options, like so:

After installing, you'll see a new application program group for that version of OpenStudio, with just Results Viewer in there.

Again, this process is not officially endorsed or supported, and comes with a couple caveats:

• I'm not entirely sure how far back you'll need to go to find a copy of Results Viewer with the smoothing function enabled (I made those plots you referenced in your original post a while ago).
• Newer versions of radout.sql and eplusout.sql may (will?) cause these old Results Viewer apps to complain or malfunction

Also, don't forget there are other ways to skin this cat. Lots of other visualization options out there, if you're willing to delve into R or matplotlib, or to spelunk the Javascript cave(s)...