No models are available for download for 8MM_SMARC_SOM_4R16E__IF573_3M_I. You can still request or build the schematic symbol and PCB footprint by using the respective build or request forms on this page.
To find more CAD model downloads similar to this part, try a partial part number search, like 8MM_S,
or try a keyword search, such as Other uPs/uCs/Peripheral ICs