Also running Big Sur beta 1(20A5299w), also trying to update to Beta 9. Get "Download Failed. An error occurred while downloading the selected updates. Please check your internet connection and try again". [Would be great if it showed the error, wouldn't it?] Software Updates window shows "An update is available for your Mac" and shows " *macOS Big Sur Beta 9 11.0" clicking "more info" show the size is listed as 11.32GB. 100% repeatable, always fails within seconds of trying to download. I need Beta 9 because window toolbars are toast under Beta 1 and may be OK under Beta 9, and I have a lot of software to test. If anyone knows someone at Apple on the DTK team, give them a heads up that the update process of the DTK is seriously broken and is holding up progress.
Also FYI, on the left side of the Software Update screen you can see "Updates for this Mac are managed externally" with a "Details" link you can click. Doing so allows you to "Restore Defaults". Don't do it. If you do, and then try and rerun Software Updates, it tells you that your Mac is up to date and you will have to re-install the beta access utility so its scripts reset the Mac back to external update management (because, duh, your default updater only looks for released software - its the beta access that knows where to find the latest beta updates)
I took a look at the System installer log and isolated the log entries for a complete update attempt as described above. Appears to me to be a failure to find the expected update package OR a permission error. In any case, I copied my log entries from my DTK mac to a text file and have attached it.
InstallLog.txt - https://developer.apple.com/forums/content/attachment/196c6171-613a-4663-9c42-ce7596c4afcc
craiglandrum
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I have exactly the same issue on macOS. Mine blows up on the PDFView drawPage:toContext. Happens when doing a stress test alternately opening and closing two PDF files. Some crashes on the first close, some on a later close.Suspect "stale" window update events that trigger PDF page redraws after the user has clicked on the window close button. What am I missing?