Just download it from:
http://www.virtins.com/MIsetup.exe. The downloaded version defaults to use the computer sound card for ADC and DAC. If you want to use VT DSO-2810H for ADC instead, stop the oscilloscope by clicking the green button at the upper left corner of the screen. Then go to [Setting]>[ADC Device] and select "VT DSO-2810H" in the Device Model selection box.