In attempt to fix this issue, please try the steps below:
Uninstall WavePad, then delete 3 folders named "WavePad" and 1 named "Components" from these locations:
**C:\Users\<username>\AppData\Roaming\NCH Software\WavePad\
**C:\Program Files (x86)\NCH Software\WavePad\
**C:\Program Files (x86)\NCH Software\Components
**C:\ProgramData\NCH Software\WavePad\
**If you can't find any of the folders, just continue.
After that, restart your computer and reinstall the program using this link: https://www.nch.com.au/components/wpsetup.exe
Once done, restart your system one more time.
You may need to register your program:
To register:
1- Open the program.
2- From the top left corner, click the three horizontal lines > "File" menu.
3- From the dropdown menu select "Register software..."
4- Enter your registration code (numbers-letters) and click on Register.
5-If successful, you'll see the "Licensed Software" status at the very top of the window, next to the program's name.