Update your Stuffit Expander. Drag & drop the bin file to expander (don't double-click it.) Update your Java:
MRJ 2.2.5 for OS 8.1-9.2 or else:
MRJ 2.2.6 for OS 9.2.2 & also see this thread about OS 9 hints:
Here for OS 9 hints with LW (click on link)
After installing softw it's always a good idea to re-build your desktop. ie: re-start your computer whilst holding down the Apple (Command) & Option keys. It's a healthy thing to do at least monthly.
Also some hints on optimising LW:
A well set-up LW can start to automatically continue its dwnlding after it's settled down perhaps 2 out of 3 times you open LW. Optimising LW & Maximising Uplds & Dwnlds A (1st post only) & also Part B which is even better & last & least are search & dwnld hints.