Hi @lwandile170, Student Licenses don't require serial numbers to activate anymore, you can now sign in with your AutodeskID. Autodesk Community, Autodesk Forums, Autodesk Forum
If you have downloaded the installer for AutoCAD Architecture 2019, you will be prompted to enter a Product Key. Because AutoCAD Architecture is a specialized version of AutoCAD, it has a distinct code different from standard AutoCAD or other disciplines like AutoCAD MEP. autocad architecture 2019 serial number and product key
Your specific license details can be found through official Autodesk channels: autocad architecture 2019 serial number and product key