The TOC for the latest beta release of the classic version (1.13.5.61_Classic-Beta) is using the retail game's version which is causing the Twitch app to download the incorrect release.

Hello,
I forgot to change it before tagging the last release :)
I'll push a new beta tomorrow and it should fix this issue.

Thank you for your report!

Oh btw, there no differences between version except for the toc version.
So it doesn't really matter ;)

I figured as much, but Classic players won't see the latest release.

That's strange, it should see it as long as there is Classic in the name :(
Maybe they changed that. Anyway, should be fix tomorrow :)

Hi again,
I've just though about it, but beta version do not show by default in the twitch client.
Might be why you don't see it.

I have the preferred release type set to Alpha for both, Classic and Retail.

Classic:

Retail:

I've just push a new beta release for both retail and classic, with proper toc version, hope it works now!