if you guys, are having disk write error when installing backup or downloading the witcher 3. follow these steps:
1. clear download cache in settings> download> at the bottom click the clear download cache button.after that steam will restart.
2. After restarting Steam then you turn off the antivirus.
3. Start downloading your files again
4. done, and have fun playing

if you guys, are having disk write error when installing backup or downloading the witcher 3. follow these steps: 1. clear download cache in settings> download> at the bottom click the clear download cache button.after that steam will restart. 2. After restarting Steam then you turn off the antivirus. 3. Start downloading your files again 4. done, and have fun playing