link to the SDK:https://www.picotech.com/downloads/lightbox/sdk-ps3000a
There is a Readme.txt, there you'll find a list of "Products supported by this SDK". The PS3203D-MSO is not on the list.
Also in the product page, if you go to picotech.com > downloads > Oscilloscopes > PicoScope 3000 Series > PicoScope 3203D MSO
, you will not find the link to the SDK.