The whole issue to change versions was due to installing a new 32GB Micro card, rather than use a 16GB card. For some reason, version 3.7.1 won't recognize the 32GB card. The installed version 3.9.1 seems to work fine, so I'm happy with it as of now.
As far as the install, for some reason, the file fuzepa needed to be located in the root directory of my fuze in order for the update to be downloaded to the proper location. I'm not sure why, however.
Thanks much for all your help!