Where should the sdbuild directory be located?

Open a terminal in your host PC and clone the PYNQ repository from the below link.
host@host:~$ git clone https://github.com/Xilinx/PYNQ.git

sdbuild directory can be found inside the cloned github repository (PYNQ/sdbuild)

For further product inquiries, please get in touch with our sales team at mktg@iwave-global.com

Please find the detailed product information here:
ZU48/47/43/28/27/25DR RFSoC System on Module