I'm not quite sure what this program is supposed to do, but if you change:

0047E314 0F84 87010000 JE HDSerPak.0047E4A1
into
0047E314 0F84 00000000 JE HDSerPak.0047E31A

and

0047E3A1 7E 5F JLE SHORT HDSerPak.0047E402
into
0047E3A1 7E 00 JLE SHORT HDSerPak.0047E3A3

You can enter any serial and then proceed. Lemme know if this is still not good enough.