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There is no PDFCreator version 4. Do you by accident try to activate PDF Architect 4 with a license for PDFCreator?
This won’t work, as those two use different license models and are seperate products.
I have a license for PDF Architect 4 Pro. That is what I was trying to reinstall
Can you send your license key for PDF Architect 4 to support (at) pdfforge.org, so that we can check your license?
I’ve sent you a private message and deactivated your old license.
Feel free to contact us, if you have any further questions.