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There is no universal "default" registration code for MixPad Multitrack Mixer Go to product viewer dialog for this item.
NCH Software uses an individual, server-validated licensing system. Every legitimate software license key is unique to the purchaser and must be activated online. Understanding how MixPad licensing works, the massive risks of using online "serial keys," and the legitimate ways to use MixPad for free will save you time and protect your computer. Why "Default" Registration Codes Do Not Exist
What do you see when you try to open or save your project? Which operating system (Windows or Mac) are you running?