If you download Titanium from the net (which is against the rules to discuss here), then yes, there is a risk of getting malicious software. But, I assume you mean "install" instead of "download". If you are installing directly from the retail CDs, and aren't downloading anything else to play, then you are at no risk. Though, if a server has custom files to download, they could potentially have malicious content in them, but I haven't seen a single server that has done that yet, and something like that would be reported quickly. Basically, you should be perfectly safe!
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