@Tatti_Tang Clear Origin's cache:
https://help.ea.com/en-us/help/faq/clear-cache-to-fix-problems-with-your-games/
Restart your computer, and repair the game: open your game library, right-click on the Sims 4 icon, and select Repair.
If that doesn't help, did you ever have Origin Access and therefore the deluxe edition of the game?
@Tatti_Tang Try reverting your game to the copy you purchased. Open your Origin library, right-click on the Sims 4 icon, select Uninstall, and choose "revert game edition." Then clear Origin's cache again, restart your computer, and see whether Origin still tries to verify the deluxe edition.
If that doesn't help, please contact EA customer support and ask that the Digital Deluxe upgrade be removed from your account. You're supposed to be able to do it yourself, as described above, but this hasn't been working with Sims 4 lately. It should be simple for a support rep to do though.
https://help.ea.com/en/contact-us/
Support is on limited hours right now: phone calls are entirely unavailable, and live chat is only open from 9 am to midnight GMT, Monday through Saturday. So it's sometimes difficult to get through.
