Help (reinstall LW Pro)

Hello,
my name is Adam Rogers and herein lies my problem. I had and purchased Limewire Pro. 4.18.8
The problem I am having is that my laptop that I had Limewire on crashed. I have another laptop but now my Limewire is only 4.12. Luckily I had this back up copy. I have the old installer but it does not work. It says that it's the LimeWire 4.18.8 Installer. That is how I know I had 4.18.8. What can I do? I cannot buy or upgrade it, as I am temporarily disabled and unemployed. What can I do? How do I get another installer?
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