There is no default or universal PAC file link from Nokia for the TA1352. The phone does not generate its own PAC file. You must obtain the specific URL from the entity requiring proxy configuration.
You must install the Spreadtrum/Unisoc USB Drivers on your PC so it can recognize the phone in "Download Mode." nokia ta1352 pac file link
Here are a few sites that have listed the Nokia C20 (TA-1352) firmware: There is no default or universal PAC file