If you have the hardware unit but no CD or the drivers on your PC have failed, you usually have three options:
The UPA-USB excels at reading code EEPROMs from Blaupunkt, Visteon, and Alpine radios. Select the correct MCU (e.g., 24C64), read the dump, and use a separate calculator tool to extract the PIN.
The original software was developed by Elrasoft. Ideally, this is where you should check first. However, updates for the original UPA have slowed down significantly, and the site can be difficult to navigate or down depending on your region.