I accidentally purchased multiple CCleaner licenses. You should be careful not to do this, as it has caused me a nightmare because I keep getting notices that my license is expiring when it is an old license that is expiring not the latest one. I have tried to get instructions on how to register the latest license without success. I need step by step instructions, and I mean step by step. Boot CCLeaner, click this, click that, click this, click that, etc. What a mess this has become. It has gone on for months without being resolved. I am at the point that I will just uninstall CCleaner and buy something else that is not so much hassle.