Spybot 1.5.1.15 installed on W98SE

I just upgraded spybotSD from 1.4 to 1.5 on this machine
and have done a successful manual update.

But if I attempt an on line update the updater (not the main program) crashes on exiting the exception message a further (program) error message is shown indication 'Richedit insertion error'
I have tried reinstalling from the same downloaded installer no change.