I cannot install the Lime Wire Pro after downloading it because I receive the message
Cannot launch Java application
The main class "com.zerog.lax.LAX" could not be loaded

It would be helpful if you were to tell us what machine and which operating system you have. Could you also please confirm that you have read through the threads under the heading Installation which, as the name suggests, is the more appropriate section of the forum. Some description of the steps you have taken in your attempt to install would also be helpful.