You can download from support.thrustmaster.cn/en/cat-joysticks-en/,visit VIPER TQS page (dont visit VIPER TQS MISSION PACK page,this page didnt show this driver), and you can find Drivers - Package 2025_TFHT_4 + Firmware [System Requirement: Windows® 10 / 11],download,install,you will find a new software named Thrustmaster TM Flight Series,open Firmware Update to update you TQS firmware,then open Control Panel,choose Enable virtual buttons,you can open your DCS and play happily.