I have Dorico 3.5 Ed version How do I upgrade?

I want to upgrade to the latest version. I have an Ed packet.

If that Ed means education, you simply buy a commercial upgrade version.
This will automatically convert your license to a commercial one.

P.S.: Since there’s a change of the software licensing method, your current v3.5 license will be renamed as something else but still usable with Dorico 3.5 and all earlier versions of Dorico.

You can buy the Dorico Pro 4 update here: