You might have a typo. The "next" button only appears with a correct serial number.
FWIW, we've had to request a second serial number for our classroom, since the first number did not get accepted...
--- stefan boeykens --- bim-expert-architect-engineer-musician ---
Archicad28/Revit2024/Rhino8/Solibri/Zoom
MBP2023:14"M2MAX/Sequoia+Win11
Archicad-user since 1998
my Archicad Book