After installing the trial version of the Telerik UI for WinForms suite, you are free to use all themes.
In order to use the Theme components, just drag and drop them from the VS Toolbox to the form. This will add a reference to the corresponding theme assembly in the project and will enable the theme in the ThemeName
drop-down of all Telerik controls on the form.
Please refer to the following help article: https://docs.telerik.com/devtools/winforms/styling-and-appearance/using-default-themes
I hope this information helps. If you need any further assistance please don't hesitate to contact me.
Dess | Tech Support Engineer, Sr.
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