@leocg I have no idea how to use that. I am assuming you add that to the Opera shortcut? If so the only drawback is that it wouldn't work if Opera was launched from another program.
Anyway I found a better option.
Delete the Opera Cache folder. Search for "command prompt", right click and select "run as administrator" Use this format mklink /d "Default Opera Cache Location" "New Opera Cache Location"For example type: mklink /d "C:\Users[NAME]\AppData\Local\Opera Software\Opera Stable " "B:\Bowser Cache\Opera"
This creates a shortcut folder that will place the cache files in the new location specified.