Hello,
Now that's a good find!
Did you try to just manually turn on the drives, by pressing the middle of the S O/I R buttons on top?
A safety issue should show up as a red or yellow error message, but make sure that all doors are closed etc.
Finally, take a look at the sps.sub, if there are variables like $CONF_MESS set from digital inputs.
Regarding training materials, if they were initially included I'm sure you can get them from KUKA again. But for e.g. the new ready2educate cell, there is a lowest tier that doesn't include any training material.
Best,
Johannes