The reason the SDK requires a license is that every sample that is part of the SDK is running in a different instance of Sitefinity which does require a license. Once you register your license in the SDK, it will automatically include the license file in all instances of Sitefinity that host samples. Otherwise, if you run the SDK without providing the license file, you will have to include it in every instance of Sitefinity which is going to be much more disturbing.
As Victor mentioned the main reason your license file is not running properly is if the name of the file contains special characters. Try the following procedure, if it doesn't work I will be glad to have a GoTo meeting with you in which I can resolve the issue directly on your computer.
1. Delete the extraction folder of your samples, by default it is C:\SitefinitySamples.
2. Detach all databases created from the samples in your SQL Server.
3. Delete the temp folder of the browser that is located in I "C:\Users\[place here your username]
\AppData\Local\Telerik\". and "C:\Users\[place here your username]
\AppData\Local\Telerik.Sitefinity.SDK\". Note that the AppData folder is hidden by default.
4. Rename your license file to Sitefinity.lic.
5. Run your SDK Samples Browser and run a sample.
If you have troubles resolving the problem with the suggested workflow, please get back to me so that we can schedule a GoTo meeting.
Thank you for your interest in the SDK, we have invested a lot of time in making it as easier as possible for the end-users but there are obviously some small bumps that we have to clear.
the Telerik team
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