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.