how do I enable 512 addresses on my console
AFAIK the minimum available on an Element is 1024.
There is often confusion over channels vs addresses. The Element comes in 250 and 500 control channel versions. All of them can do 1024 addresses. The difference is that a channel for a moving light can use 20-50-ish addresses. Many LEDs use 6+ addresses, but can often run in 3 or 4 address modes.
So, you can do 21 movers with 50 addresses each or 250 (or 500) one address dimmers.
Make sense? If not, give us some details on your case and we can be more specific,