Buying Limewire Pro gets you 6 months free updates, after that you have to buy again. Your 6 months must have run out. Next time make a back up copy of the pro version you have.

Are you sure you got if from the official site: limewire.com

You can use "creative ways" to try and get another copy but you won't know if it's infected or not.

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If it ain't broke, fix it till it is!