If you are not seeing the update in the Mac App Store, use my Software Update Patch from post
#679 with the Developer Beta CatalogURL checked and Software Update patch unchecked (as it may overwrite
@dosdude1's patch).
OR you can just use this terminal command:
Code:
sudo /usr/sbin/softwareupdate --set-catalog https://swscan.apple.com/content/catalogs/others/index-10.12seed-10.12-10.11-10.10-10.9-mountainlion-lion-snowleopard-leopard.merged-1.sucatalog.gz
Then restart the App Store and/or Mac a few times.
This should allow your Mac to receive all future Developer's Betas from now on. I don't know if anything else really changed as far as this.