I have an old Acrobat 8 Pro, I bought from staples in 2010 i think. I was working and it stopped. then it asked me my number. what is happening?

I have an old Acrobat 8 Pro, I bought from staples in 2010 i think. I was working and it stopped. then it asked me my number. what is happening?

Please help I am in the middle of work I need to submit