Hi,
Did you download the right file? You should have downloaded the uBook08n_ppc_arm.zip file, which contains the file uBook08m.PPC_ARM.CAB (I know the file says it's version 08.m but it really is 0.8n when installed, developers fubar

)
The url is
http://www.gowerpoint.com/uBook08n_ppc_arm.zip
You sound like you know what to do with the CAB file once you have it (ie, copy to PPC somewhere and double-click in file explorer). There shouldn't be any difference between axims and ipaqs installing either. Let me know if you still have any more problems.
Craig.