OS X El Capitan Update Public Beta 3 could not be verified

[LukeWorm]

I have tried twice now to install Public Beta 3 on my MacBook Pro mid-2010, and both times I got that same error and message after the "restart to install". Then I'm asked to click Restart and I'm back to where I was (Public Beta 2 level).
I can't figure out any fix, except waiting a day a or two and trying again.

Edit:
Tried third time: download from App Store as usual, but then Restart from the Apple menu instead of the Update procedure. The Software Update install started and now I have build 15C40a. However, this Public Beta 3 does not show up in the App Store update list, not as installed and not as available. I'm having a hunch that there is a problem with App Store.

 

[Luis Mazza]

I'm having the same issues on 15" Retina Macbook Pro 2013, but they started yesterday with the dev build.

It seems download is not completed, but the process finishes and asks for installation.

Also, the download stops and restarts by no apparent reasons or is incredibly slow.

 

[Luis Mazza]

Does anyone know if I can download the delta by other means, without being a developer?

 

[LukeWorm]

Does anyone know if I can download the delta by other means, without being a developer?

You can register here https://beta.apple.com/sp/betaprogram/welcome
No need to be developer.

 

[Luis Mazza]

You can register here https://beta.apple.com/sp/betaprogram/welcome
No need to be developer.

That is only to download the utility that enables updates to beta versions... Thank you, but that's not what I'm asking for. I would like to download the installation file with the update, so I can manually start the installation without the App Store, which seems to be our problem here.

 

[Luis Mazza]

I have tried twice now to install Public Beta 3 on my MacBook Pro mid-2010, and both times I got that same error and message after the "restart to install". Then I'm asked to click Restart and I'm back to where I was (Public Beta 2 level).
I can't figure out any fix, except waiting a day a or two and trying again.

Edit:
Tried third time: download from App Store as usual, but then Restart from the Apple menu instead of the Update procedure. The Software Update install started and now I have build 15C40a. However, this Public Beta 3 does not show up in the App Store update list, not as installed and not as available. I'm having a hunch that there is a problem with App Store.

I found the solution:

http://hints.macworld.com/article.php?story=20121012020512148

It worked for me... I can download it compltely now. Good luck!