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.
The reality, however, is that finding a for the Nokia TA-1352 PAC file is challenging. These files are proprietary to Nokia and are not publicly hosted on official websites. They are shared unofficially by third-party services and on GSM forums. The responses in these threads often echo the same challenge: "I don't have it either". nokia ta1352 pac file link
If the process does not start, your PC likely lacks the proper drivers. Reinstall the Unisoc drivers, try a different USB port (preferably USB 2.0), or change the USB cable. There is no default or universal PAC file