Re: Legacy edition downloads by itself on launching origin
@Vatzfu Origin tries to download all the DLC that you own for a given game, regardless of whether you wnt it or not. If you see it downloading, you can cancel it in the Download Manager, which you open by hovering over it in the lower left corner of the Origin window. However, Origin will likely try to redownload the Legacy Edition again the next time you repair or update Sims 4, or clear Origin's cache.
The only way to stop this from happening permanently is to contact EA customer support and ask that the LE be removed from your account.