I have installed all the applications that come with the drive, but since I don't have a serial number, it was impossible for me to activate it. However, open the application you have and then go to Help > Register and enter your data.
Keep in mind that not all of the apps are needed for this procedure, because there are some free ones as well. There is also a Premium version of the software that needs registration. Use the above solution to activate it.
In case you need further assistance, contact Seagate Technology LLC using the following link: http://www.seagate.com/gb/en/contacts/