No. Modding is allowed in the game and as such you are free to download anything you may find interesting from the website.
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The Sims 3 cannot be installed if you do not have the Sims 3. Razor is a group of hackers that "crack" games to make them playable by anyone who downloads and plays it. This is a violation of copyright and is illegal.
yes, but it's illegal
You must have the sims launch open, and the hair/whatever, must be installed on to the sims. Also, you must be logged on in your launcher!
If it is a trial, no, if it isn't, yes.
That would be illegal. If you want the code, you'd have to buy it.