First, thank you very much for upgrading to the CORP version! Your support helps to fund development and keep new versions coming out with the same pace of changing technology!
Second, you’ll need to remove the previous license from the computer. This is done by:
Launch the GUI version of BulletProof FTP Server for Windows
Clicking the “About” button
Now, hold down Ctrl + Shift + Alt and Left-Click the section labeled “Licensed for Use”
Click “Yes” to confirm removing the license
Then click the “Enter Key” dialog after the program terminates