Hiya...
First, there is absolutely no need to 'update' to the Pro version and doing so will in no way solve your problem(s).
Have a look at the following links...
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If LimeWire Will Not Load
and
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Fixes For Limewire When LW Isn't Operating As It Should
If all else fails and your Limewire installation seems to be OK except for the connection, please do this...
>
System details - Help us help you > Provide these details when you post ! 