Very confused by the whole 'receiving updates via System Preferences' issue. Installed SWUSwitcher -- thought this was supposed to eliminate necessity of going thru Apple in any way -- but, even though I could set Developer Preview or Public Beta in SWUSwitcher, and these seeds would then show as "enrolled" in Software Update, no updates would appear.
Next step: Went to Apple, enrolled in Public Beta (no choice, since not a paid developer account holder), installed Apple's PublicBetaAccessUtility and, voilà, PB5 download appeared immediately in Software Update -- full version, not update, but that makes sense since I'm updating from DP5, not PB4. Proceeded to download PB5 via Software Update (verified the version number), downloaded macOS Mojave Patcher 1.1.2 from here, and installed the downloaded PB5 on my USB stick (intending to use only for patches, or as a backup install if internal update failed).
Tried to run the new PB5 version of
Install macOS Mojave Beta from my Applications folder and, as soon as I tried to choose my destination drive, got hit with the rude message: "This version of macOS cannot be installed on this computer." Drat! Re-installed Software Update Patch from Patch Update, rebooted, and tried again. Same error message from the installer. What gives? I thought the whole idea of the Software Update Patch was to allow the macOS installer app to run on an
unsupported machine.
Maybe
@dosdude1 can explain how this is all supposed to work.
(Sigh.)