@Allan - Thanks for sharing that. I experienced the same issue and trying again with this command line. Download and preparing moving along fine. Waiting for successful install
TheFatChrisPratt
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Went into terminal and copied @isbkch to see what would happen. I had a positive result showing this:
Finding available software
2020-08-22 16:18:03.093 softwareupdate[739:12281] Creating client/daemon connection: 94E540D0-BC14-4AEE-A85D-54E0E81F0BBF
Downloading macOS Big Sur Beta 5
preparing: 65.68%00%
The good news is that it started at preparing: 65.34%. Moving very slowly, but moving I suppose