Add-on is not installable

I can't for the life of me get the Lovestruck add-on installed. 

I have already tried everything listed in this old thread (https://forums.ea.com/discussions/the-sims-4-technical-issues-pc-en/current-issue-sims-4-dlc-shows-as-installed-wont-load-in-game/11831673 ) but nothing works. It looks like the SS above, I've looked at the files. I don't have CAS Demo but from what I understand it is not needed. 

Last thing to mention is that this was bought as a "Pre-order bonus", but from my experience that doesn't entail anything other than that you just get some items extra or whatnot, not that it would actually be something different from an expansion pack entirely.