the average user should be here: https://windirstat.net/download.html

but for both, the first instruction is just plain download. i think the average user can handle that. the others are alternatives for users that are familiar with them. i don't see the problem.

what could be changed is to add a message like: "if you don't know which one is right for you, you probably want this one:" followed by a link to the win-x64 version

To be clear the problem isn't WinDirStat's fault really. The problem is that users won't find that site (nor the GitHub one) because they're trained to go directly to the App Store and look for whatever app they need. And WinDirStat isn't in there, while numerous ripoffs are.