This PCB5.0 Willem programmer has two hardware modes: PCB5.0 and PCB3B. The programmer is shipped with PCB5.0 jumpered as default. PCB3B mode can be realized by just moving 2 jumpers. You will be able to use the older software such as 0.97ja when the programmer is jumpered in PCB3B compatible mode. The following photos will show you how to do it. :

1, PCB5.0 mode (older software 0.97ja won't work under this mode):
2, PCB3B compatible mode, where you may use the older software, such as 0.97ja: