Well, after many efforts of trying to figure out the library dependency issue (as well as trying this out on separate computers–both running Windows 10), I eventually found a way to get around my problem: Download KNIME version 3.6.2. (Originally, I was trying to use the latest version of KNIME 3.7.2.)
You can download previous versions here: https://www.knime.com/download-previous-versions
I suppose this issue may be beyond my control, as at least based on my installation attempts, it seems to be related to a compatibility gap between the newest versions of KNIME and the RDKit extension.