In general, you’ll still have access to deprecated stuff to download to use. You just can’t buy it anymore (and likely won’t get future support from the dev either). For example:
Now your item from Art-Coding, however, is different, because Art-Coding appeared to be a bunch of pirated models:
According to this thread you should be receiving a personalized email from Unity, but I would follow up with them to be sure. Since these were pirated models, don’t use them at all, but you should also get a refund.