To install a .package mod for Sims 4, follow these steps:

1. Download the mod from a trusted source.
2. Extract the mod file (if it is zipped).
3. Open the Sims 4 folder.
4. Create a new folder called “Mods”.
5. Copy the mod file into the “Mods” folder.
6. Start the Sims 4 game.
7. Go to the “Game Options” menu.
8. Select the “Other” tab.
9. Check the box next to “Enable Custom Content and Mods”.
10. Click “Apply” and then “OK”.
11. The mod should now be installed and working in the Sims 4 game.

Here are some tips for installing mods:

• Only download mods from trusted sources. There are many websites that offer mods, but not all of them are safe. Make sure to only download mods from websites that you trust.
• Make sure that the mod is compatible with your version of the Sims 4. Some mods are only compatible with certain versions of the game. Make sure to check the mod’s description to see if it is compatible with your version of the game.
• If you have any problems with a mod, try uninstalling it and then reinstalling it. Sometimes, uninstalling and reinstalling a mod can fix any problems that you are having.
• If you are still having problems with a mod, you can try asking for help on a Sims 4 forum or subreddit. There are many people who are willing to help with mod problems.