If we do not install the latest version, some bugs may remain unfixed, resulting in not just the  OKI printer offline error but also additional issues. As a result, anytime you see a new update, make sure to install it right away. Open Settings and then go to Update and Security to see if there are any new updates available. Look for the Check for Updates option and, if it is available, install it. It can take some time, so be patient and wait for the modifications to take effect before trying to print.