Hi,
In this situation, reinstalling the software would be the recommended course of action.
Uninstall MixPad, then delete 3 folders named "MixPad" and 1 named "Components" from these locations:
**C:\Users\<username>\AppData\Roaming\NCH Software\MixPad\
**C:\Program Files (x86)\NCH Software\MixPad\
**C:\Program Files (x86)\NCH Software\Components
**C:\ProgramData\NCH Software\MixPad\
**If you can't find any of the folders, just continue.
If you can't find the AppData folder, set Windows to show hidden files and folders with the steps from this link: https://support.microsoft.com/en-us/help/14201/windows-show-hidden-files.
Please download the software version that corresponds to your license and proceed to enter your registration code. Should you require any help in locating the appropriate version or retrieving your registration code, please feel free to contact NCH technical support for further assistance, here is the link:
https://www.nch.com.au/support/index.html