Where I can get a SDK or api with user mannul or reference

DVI2USB 3.0, SDI2USB 3.0 General
1

I try to write a program to get a online video from VGA2USB. How can I get SDK or third-party api.

2

Unfortunately the SDK for signature series devices was discontinued in 2020 and are no longer available. You can utilize FFMPEG style commands and directshow for device functionality however!

I sincerely apologize for the inconvenience