The standalone installer for the supplemental update is at https://support.apple.com/kb/DL2038?viewlocale=en_US&locale=en_US
This brings the build up from 19E266 to 19E287
There is a new delta and combo too at
support.apple.com
and
support.apple.com
The full installer still says it was published 2 weeks ago which suggests it is still on build 19E266 however I suspect this too is actually 19E287 now despite what it says in the mac app store:
The full installer is at https://apps.apple.com/us/app/macos-catalina/id1466841314?mt=12
I will download the full installer and see if it really is build 19E287.
I hope it is because if it is I will be able to use it to downgrade the 10.15.5 beta 1 build 19F53f to 19E287.
If successful I can then do a time machine backup of 19E287 and then upgrade again to 10.15.5 build 19F53f.
At least that's the plan.
But it all depends if my theory is correct that the full installer now is really the new version.
This brings the build up from 19E266 to 19E287
There is a new delta and combo too at
Download macOS Catalina 10.15.4 Update - Apple Support
macOS Catalina 10.15.4 introduces iCloud Drive folder sharing, Screen Time communications limits, Apple Music time-synced lyrics view, and more. The update also improves the stability, reliability, and security of your Mac.
and
Download macOS Catalina 10.15.4 Combo Update - Apple Support
macOS Catalina 10.15.4 introduces iCloud Drive folder sharing, Screen Time communications limits, Apple Music time-synced lyrics view, and more. The update also improves the stability, reliability, and security of your Mac.
The full installer still says it was published 2 weeks ago which suggests it is still on build 19E266 however I suspect this too is actually 19E287 now despite what it says in the mac app store:
The full installer is at https://apps.apple.com/us/app/macos-catalina/id1466841314?mt=12
I will download the full installer and see if it really is build 19E287.
I hope it is because if it is I will be able to use it to downgrade the 10.15.5 beta 1 build 19F53f to 19E287.
If successful I can then do a time machine backup of 19E287 and then upgrade again to 10.15.5 build 19F53f.
At least that's the plan.
But it all depends if my theory is correct that the full installer now is really the new version.