Do consult the FormalAddress Help first but if you can't find what you need you are welcome to contact support at email@example.com.
To my absolute astonishment FormalAddress 4 works on macOS Big Sur 11.2 with two minor issues:
1) When you choose a new Workspace (usually Cmd-N) the previous formalized address is not cleared. Just resize the window a trifle to clear it.
2) The Stamp tool does not update its color when it changes state. You can hover over it to get the tooltip to see what state you’re in.
Neither of these issues will be fixed as FormalAddress is no longer for sale.
May be found here.￼