Afaik, you can't, if you haven't played any of them.
Besides, only the season previous to the current one can be accessed to claim season pass rewards
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You are mainly paying for the DLC upgrade and access to all quests locked behind seasons. Most of the weapons you could unlock were from the decryptor in the helm which you had to play thru those specific activities to get access to
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To each their own, but I wouldn't pay 30 dollars for some ornaments, though I would pay 30 dollars to actually play the game. Also, I don't think seasons can be refunded, so if they've already been redeemed on your account you may end up with a negative silver balance.