Download and install the latest printer drivers - Microsoft Support
Since this is an older printer, Windows 10 might not install it automatically via USB. You must install it manually:
They offer free, high-performance Windows drivers specifically for the TallyGenicom 6800 series that work on Windows 10.
: Maintains a database for TallyGenicom 6810 Drivers compatible with both 32-bit and 64-bit Windows 10. Installation Tips