Right now those options only work for submittions via our API since that ws the only way to post multiple releases for game versions as well.
https://www.wowinterface.com/forums/...ad.php?t=51835
If you submit an update via our API that includes multiple toc compatibility it will enable multi-toc with the green text and it will delete classic and tbc releases if you previously had multiple downloads. You can also submit to the multitoc data point and enable multi-toc as well. This functionality has only been added early this year.
For multiple download buttons that also requires the api and when you upload an update with a classic game version or a tbc game version its uploaded separately from retail and added as an additional download. We've had this functionality since classic.
https://api.wowinterface.com/addons/update
Hope that helps.
Now if you already have some multi-toc addons and you dont want to use the API just link me them and I can enable it for you.