When you purchase an LTD account or an AppSumo account, you will need to use a brand new email address that has not been used in the Vonza platform before.
You will not be able to connect an existing trial account to the new LTD / AppSumo account.
Note that at this time, Vonza is not currently offering any sort of AppSumo account plans.
To purchase a plan, visit https://vonza.com/pricing