Catalina import old corpus

I had to setup a computer with macOS 10.15 completely new, but after configure SpamSieve in the old way all incoming mail is deleted. I have no time exploring the reason because in the view of a user this is wasting my time so I want to use my old preferences and my old corpus.

Could you please tell me the needed patches to set up SpamSieve with old setup manually?

Thank you in advance
Ralph

You can copy your training data from another Mac or a backup.

Thank you Michael for very very quick reply. You made my day!

Best
Ralph