There is probably a way to tell the MSI installer service to simply extract the contents of the installer, rather than actually putting it in "C:\Program Files\".
If you cannot figure out how to do that, another thing that should work is simply copying the "C:\Program Files\Calibre2\" directory to "C:\Users\Jackie_w\My Documents\", then installing the beta. Run the production version from wherever you copied it to, run the beta by default. Or install the beta, copy that to a secondary location, and then reinstall the production version.
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