Restart Steam and your PC
Run Steam as administrator
Pause downloads and resume them
Clear Steam download cache
Change Steam download region
Verify game files
Repair the Steam library folder
Move the game to another Steam library folder
Check disk space
Check the drive for errors
Remove read-only status from the game folder
Disable antivirus or add Steam as an exception
Close background apps using the disk
Update storage drivers
Reinstall the game
Reinstall Steam
Check for failing hard drive or SSD issues