Just an update: After moving the Install macOS Big Sur Beta application to my external hard drive, it downloaded just fine. No issues with storage. I'm happy to report that I'm running Version 11.0 Beta as we speak.
marine7382
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I'm definitely no "developer" but I found a much simpler solution that seems to be working so far. I transferred the "Install macOS Big Sur Beta application to an external hard drive, deleted the app from my computer, then ran it directly from the EHD and still selected to install the OS onto my Macintosh HD disk. I still have 12 minutes until it finishes installing, so cross your fingers!