Clearing the Steam download cache will cause the Steam client to flush locally cached configuration data and acquire it from the Steam servers again.
Some Mac users may be experiencing the error message "Upgrade Failed" when attempting to play Roblox by clicking on the app.
To correct this issue, please go to your web browser and click Play instead from the game's details page instead.
Finally, opened the WC3 installation folder through the Finder and executed Blizzard and was able to complete the patch. Verified that both Blizzard Prepatch and Warcraft III Launcher had no execute permissions and gave execute permissions to both (chmod u x Blizzard Prepatch Warcraft\ III\ Launcher)3. This gave an error in the console but Blizzard and Warcraft\ III\ appeared in the WC3 installation folder4.
Finally, opened the WC3 installation folder through the Finder and executed Blizzard and was able to complete the patch.
Please note that in order to resolve certain update errors, this article may recommend steps such as rebooting your router or Sonos products.