Bandicam Software Registration Number Lost

Hi, all I bought a new laptop and wanted my Bandicam software to be transferred and installed to it from my pc. What I did is I transferred the system files of Bandicam to my laptop. When I run it, an error pops up and said that I need to re-download it. So, I uninstalled the program and downloaded it again from its site. I installed it to my laptop, it worked but there’s a watermark on it. Now, I have to put the registration number again but I don’t have it anymore, I could not find it. I purchased the software just two days ago. Can I retrieve the registration number back and have it emailed to me again? Or I’ll buy a new one in order to have a new registration number. Give me some tips and suggestions as I’m such a noob in this one.
