If you have it you can reactive it. Source: I did it.

I think there's a way to still download it too if you google fu

That just means it's time to stop using Chrome. I recommend looking into Brave or Pale Moon.

That's Google's polite way of saying that you're using a Manifest v2 extension and support will be discontinued in June. At that point you're reliant on your browsers adblocker or you'll have to switch to a Gecko based browser.