The fact that it was adding it to the x86 directory structure indicates, I suspect, a left over registry entry that is confusing things. That is where the Legacy would go. The %AppData% directories are not entirely incorrect for programs - possibly not intuitive for those of us who have worked with Windows for many years. But it is where the v10 applications should install - even if it doesn't make sense
That's why I recommend a thorough clean out and reinstall.