How to use the Zip component trial?

How to use the Zip component trial?

I suppose should be easy to do, but I'm not able to use the component as a trial.
My first attempt was to refer the library from NuGet, but the debug breaks on this exception:
System.Exception: 'Xceed.Compression.Formats.Licenser.LicenseKey must be set to a valid trial or registered license key in the code of your application before using this product. Please refer to the Licensing topic in the documentation for specific instructions on how to avoid this exception.'

Then, I tried to download the installer from your site, but the result was the same. Also, recompiled, restarted the machine, etc.
From what the docs say, it seems there's no way to use the library without a license.

Finally, I honestly don't remember if I've already tried something yours (hence the license problem). Is there any way to check it?
Thanks in advance