You must download China Rising, and then go to the games section of the XMB and click on the China Rising bubble in order to install the China Rising.
If you redeemed the voucher in a BF4 Limited Edition to get free access for China Rising you first must redeem the code, allow it to download to your PS3, then restart BF4, go to the BF4 in game store and download the expansion, close BF4, then after it downloads click on the China Rising bubble in order to install the expansion.
After you install the expansion be sure to open your server browser filter and add the china rising maps or you won't find any games on China Rising.
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