Another possibly helpful comment is to not only delete the old PTR folder, but to make sure you download the patch from the site and not just use an old one of the same name... I can't imagine anyone doing this though... *whistles while blushing*

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Q u o t e:
Why can't we get a blue answer? Wryxian was very alert -until people started having these problems

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I don't have any information at this time, that's why. I am hesitant to post when I don't have anything to suggest. We can see people are playing on the realms, so it isn't clear yet why some people can't.

I might be clutching at straws, but are you using Battle.net merged accounts or accounts not yet merged into Battle.net?

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Q u o t e:
Wryxian, are you able to confirm that we are definitely getting the correct file from the 'Download the Client' link, which is WoW-3.0.1.8874-PTR-EU-Installer-downloader.exe (for PC).

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Yes that is the first file you need.

I have taken the account names of those experiencing the issue who have posted in this thread, and the issue has been reported internally for investigation. When we get an update, we will endeavour to share it with you.

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Q u o t e:
I have the same problem.
"This download is not authorized."
WoW-0.2.0.10128-to-0.2.0.10147-enGB-patch.exe

I'm also on a battle.net account.

EDIT: *** SOLUTION ***
If you now have a battle.net account, use your OLD account name and the downloader will work.
My downloader is now downloading "WoW-0.2.0.10257-enGB-ptr-patch.exe" successfully.

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Nice find!

Though as reported earlier, people found a work around, we have also made a fix that we think resolves this issue. Please can you retry and let us know. Thank you! :-)