First, you have to Unenroll your Devices
Developer Program Members
Beta Program Members
Regular Software Updates
Customer Seed Updates
You can change or add the CatalogURL with:
sudo /usr/sbin/softwareupdate --set-catalog [URL]
Update: In case you run into ERROR_12DBCCA60C then make sure you have
with the following content:
5. Reboot and enroll your Apple Beta ID again at Beta.apple.com
6. The last step is a little bit tricky
Some people now can update beta 4 in the update section like regular update method.
Maybe it is still not working for someone else which is in my case yet when you find High Sierra app in App store search, the app actually is 10.13.4 beta 4
So just download and install it on the step by step and you will get the installation process for High Sierra 10.13.4 Beta 4.
Last modified: March 30, 2018