Can't update

Janaque​  Before spending any money on an external drive, let alone an entirely new laptop, try repairing Sims 4 rather than running the update.  A repair will give you the updated version without requiring as much space as the Update function does.

Sims 4 itself is just over 60 GB with all packs installed.  That doesn't include saves or other user content.  How large is your Sims 4 folder in Documents > Electronic Arts?  You can right-click it and select Properties, then see the size in the General tab.

Please also let me know how much free storage you have on your C drive.  And I can help you look for other sources of bloat if you want.

LeighsGarden​  I don't know why you would suggest someone get a new laptop when you only have one detail about the current one.  Some laptops with a 256 GB internal drive are perfectly capable of running Sims 4.  And the base game is more like 21 GB, not 51, unless you meant players should have 21 GB for the game and another 30 GB free in general.

Also, no one needs 1 TB for Sims 4, and that's also not the important detail in shopping for a gaming laptop.  Drives can be added or upgraded; the processor and graphics card cannot.