Product activation and use of my own database after upgrade to SDL Business Mangaer 5.3

Hi there,

after my upgrade to the current version of SDL Business Manager (5.3.30), I see an empty database. Could you please tell me how I can make use of my own db which I use since 1 year and which contains all my data? 

Also, I'm not able to activate the upgraded installation. Please tell me where I can find my Product activation code (each time I am wondering why this is necessary at all and why it is so complicated?) I do have the license manager installed and it contains my PC name as license server name but without the Product activation code, I obviously cannot activate my copy.

I'm looking forward to your reply.

Best regards,