How to change Dotfuscator serial when the subscription is expired

Right now, PreEmptive Dotfuscator Pro is the only obfuscation software that works with Windows Phone, Windows Store and universal apps. So, I use it from time to time.

Today, my license expired. As an MVP, I have the chance to be able to renew my license. However, changing it within an existing Dotfuscator install is not straightforward.

You need to delete all the contents of the C:\ProgramData\PreEmptive Solutions\Dotfuscator Professional Edition folder, and then, relaunch DotFuscator.