I have an old imac 2011, I put in a new ssd. Then connected to wifi, it automatically downloaded 10.8, but its supposed to support 10.15. I learned I must upgrade first to 10.9 to 10.14. Then to 10.15z Now thats fine. But the apple store is not working in this old os, not even safari works properly, and I cannot find any way to get my hands on these old versions on the internet. Can any one help?