When entering my serial number into Clip Studio Paint I get the message "Please enter your 12- or 13-character activation code." - Clip Studio Official Support
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![Let's get ready : Downloading software, confirming the serial number and installing|CLIP STUDIO - YouTube Let's get ready : Downloading software, confirming the serial number and installing|CLIP STUDIO - YouTube](https://i.ytimg.com/vi/i3XIN1ntWAw/maxresdefault.jpg)