Re: Packs wont download
Try these tips:
1. Fully exit out of the game and Origin. - If exiting Origin isn't working, open Task manager (Ctrl-Shift-Esc) search for a file called ts4.exe. Click on it and select end process.
2. Try resetting the installation folder for Sims 4.
To do this, go to Origin and click Application Settings, select the Installs and Saves tab and re-select the location to install the game to.
For example: Install Sims 4 to: C:\Program Files (x86)\Origin Game
This should help Origin reset the download and see any new updates or content ready to download and install.
3. If the above two steps don't work, try uninstalling/reinstalling Origin.
https://help.ea.com/en-us/help/origin/origin/manually-uninstalling-origin/
You don't loose any Sims 4 files, as they are installed in different folders. If you are concerned about this copy the Sims 4 folder to a USB key.
Reference Link:
General Download Issues
https://answers.ea.com/t5/Technical-Issues-PC/FAQ-Serial-Codes-Game-Activation-and-Download-Issues/td-p/4228232#download
