I have SDL studio 2017 and today I am not able to launch it as it says License expired. I tried to activate but it says Activation failed. Activation not allowed as remaining quantity is 0. I have looked at the troubleshooting page. I don't have it open on another PC. I am not sure if someone else is using my code - how would I find out? The final option seems to be returning my code? What can you suggest?