@Cashmille I would start by testing with Island Living disabled, to see if the base game plus City Living works. If not, disable CL too. Here's how:
https://sims4.crinrict.com/eng/2017/03/disable-single-packs/
Be sure to test with a clean game folder, as in, move the Sims 4 folder out of Documents\Electronic Arts and onto your desktop. That way, any files related to the missing pack(s) won't interfere.
If the game runs with one or both packs out of the way, you can keep playing like that; if and when you get a new computer in the future, you can redownload the packs for free. Or you can try to get a refund from EA customer support. Normally packs aren't eligible for refunds, but exceptions are sometimes made when a computer cannot run the content at all.
https://help.ea.com/en/contact-us/