Once you receive the serial and link from SudeepAudio.com, follow the steps given in the link below carefully to install and activate your Finale software.
Step 1: Create and login to your MakeMusic account here
Information while creating your account includes which product you are trying to register and your serial number (serial numbers begin with four letters and then have eight alphanumeric characters after a dash; i.e. HFER-########).
Step 2: Register your serial number received here
Follow the on-screen instructions carefully and complete the one-time process.
Done.