World Bundle not showing up in game
xEthereal_Angelx It's generally not necessary to login to the launcher in order to install or use Store content. And when it is, the content won't install at all without the login; not doing so wouldn't cause the content to install but fail to load.
Please try installing one of the worlds into a clean user folder. Move or rename the Sims 3 folder in Documents > Electronic Arts, open the launcher to spawn a new folder, download a fresh copy of one world, and (this is crucial) wait until the thumbnail changes from a generic box to a preview of the world. Then install it and see whether it shows up. If it does, quit and install the other world, then test again.
If this works too, you can move your saves and anything else important from the old folder to the new one. I would however reinstall any other Store content you already own, unless this would be a major inconvenience (and in that case let me know; I can write out a workaround). But custom content is fine to transfer as-is. This post summarizes the content you might want to preserve:
