The USB C Port on this printer is used for both charging the battery and connecting to a PC for printing.
Before Connecting the Printer:
In Windows, download Normal POS Driver VL2.0.3.exe (bottom of this page) and run the install program.
Now you can connect the printer and power it on.
STIGMA MHT-P8008-US Printer Driver
File: Normal POS Driver VL2.0.3.exe
bc22bea6f881477e7cb70b732db297fd09d74a4fc10b7a1218aef102fe0c2c9e
(Older Version) STIGMA MHT-P8008-US Printer Driver
File: Normal POS Driver VL2.0.1.exe
c79799166dcfe8839f407263f1b6ecf699288908f60296ca1b4f92e55644e68a