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There is an error while removing the trial:

Error 1722. There is a problem with this Windows Installer package. A program run as part of the setup did not finish as expected.Contact your package vendor.

How do i remove the trial version?

Try to remove MySQLDirect .NET manually:
Stop Windows Installer service;
Delete key in the registry
HKEY_LOCAL_MACHINE\SOFTWARE\Classes\Installer\Products that corresponds to MySQLDirect .NET;
Delete key in the registry
HKEY_LOCAL_MACHINE\SOFTWARE\Classes\Installer\Assemblies that corresponds to CoreLab.MySql.dll;
Remove all CoreLab.* assemblies from GAC;
Stop IIS service if you install Web demos virtual directories;
Remove \Program Files\CoreLab\MySQLDirect.NET folder.
After that you can install MySQLDirect .NET again.