This error is fixed in ListPro 5.1 for Windows. You can download the latest version here.
When you register a ListPro trial version on Windows Vista or Windows 7, you may see:
"Registration info could not be saved".
To resolve this, right-click on your ListPro program shortcut, then choose "Run As Administrator". Enter your registration name and key again, and the program should remain registered when you run it normally.
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