Inside the Valentina Developer Network zip file are sub-directories, and one of them contains "NFR" server files. What are they?

Unlike Valentina Studio or the Valentina ADK products, Valentina Server uses server files. Server files are loaded on start up and contain licensing information necessary for Valentina Server to function. 

When your order completes, Paradigma Software emails you a list of serial numbers as well as a zip archive. If you open it, you will find two sub-directories:

 VServer_Embedded contains the information you need to deploy copies of the 'embedded' version of Valentina Server with your solution.

VServer_Office_NFR is something different!

Special Additional Benefit only for Omegabundle for Xojo 2025: NFR Servers!

Along with your developer file for the 'embedded' version of Valentina Server, Omegabundle for Xojo 2025 also get an additional bonus: three copies of Valentina Server (Unlimited) not-for-resale version.

Not-for-Resale means they are licensed to you, but the license can only by used by you and cannot be transferred to someone else.

You get one copy for each supported operating system: Linux, macOS and Windows.  These NFR copies of Valentina Server support unlimited numbers of connections. After you get them set up, each one will allow any number of connections.