We apologize for the inconvenience this may have caused. You may try the steps below:
Uninstall Stamp, then delete 3 folders named "Stamp" and 1 named "Components" from these locations:
**C:\Users\<username>\AppData\Roaming\NCH Software\Stamp\
**C:\Program Files (x86)\NCH Software\Stamp\
**C:\Program Files (x86)\NCH Software\Components
**C:\ProgramData\NCH Software\Stamp\
**If you can't find any of the folders, just continue.
When everything is done, install and register the software once again.