I am running Mac OS X 10.4.11 on iBook G3 466MHz. It is fine enough for kids to play with. One of the important skills I wanted them to learn is touch typing. Your software looks perfect for this, but it is not running on this G3 processor. I assume that in the compiler tool it is just a question of including G3 processor to make that software available on that nice little iBook G3.

Can you help, please?

It could be true that the current Mac OS version is not running with an Power PC. Unfortunately we are not getting much response for this type of processor. I thought we compiled version 2.1.0 for PPC too, but we already get one response which said it doesn't work.

So could you please try the older version of Tipp10 which never made problems with PPC? You can download it here:
http://www.tipp10.com/de/download/tipp10_mac_v2-0-3.zip

Another possibility is, if your kids iBook is connected to the internet, to use our new online version of Tipp10. It's not fully translated yet (but most is) and we will publish it in the next weeks. But if you like you can already use it. You can register for free here:
https://online.tipp10.com/en/auth/