Either simulate shadows (i.e. fake them) or find someone with a credit card.
You are asking permission to do something illegal. There is no way any Unity rep is going to say, "Yeah sure, use a cracked copy."
Do you really "need" shadows? Does the game play rely on shadows?
If you are starting on Unity, first get your game working in free. After is is working evaluate if you can improve it with pro (e.g. shadows). Worst thing would be to buy Unity pro then get bored or stuck and not finish your game. Get it working, then use the 30 day trial of pro and make sure you need it.
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