SEP is geared towards enterprises, not consumers. For consumers, you'd look to Norton Security.
I don't know anything about the laptop you have but if it was a school laptop then that could be the reason. When Symantec contracts with schools they usually offer SEP for "home use". The schools admin gives it out to students to install and be protected for free. But the end user is expected to "administer" it so to speak. I doubt the school admin would even help or could care less once the student leaves.
In this case, this is SEP 11. It went end of life back in 2015. Honestly, remove it and find something else that fits yours needs. The product is no longer receiving updates (and won't) or protecting you.
At this stage you likely don't have access to SEP 12.1 or SEP 14, especially if this was part of the home use program.
Basically, it was a free install at the time, the product went end of life and is no longer supported, and now you're stuck with what remains.