I just purchased Photoshop Elements 2020, not realizing that my old Mac doesn't come near the system requirements and never will. Is it possible for me to download an older version and just call it even?
You will not be able to make an exchange to an older version through Adobe, but you should be able to get a refund within 30 days of your purchase. Older versions are sometimes available online, but be careful about scammers. There are a number of them on eBay.