Hi, @HamodaGA
Here's a description of each:
DEVELOPMENT LICENSE
A development license is used for creating new applications and programs. This option can be purchased as a single seat or as part of a Volume License Agreement (VLA). This category of license includes a home exception, which allows for the installation and activation of the software on one home machine.
DEPLOYMENT LICENSE
A deployment license is required for distributing applications developed using a particular software product. You must purchase one deployment license for each target computer on which the application will run. This option can be purchased as a single seat or as part of a VLA. This category of license does not include a home exception.
DEBUG LICENSE
A debug license for a particular software product provides the permission to install that software on one computer. You may use the software only to fix issues on an application or system that has already been created with a development license. This option can be purchased as a single seat or as part of a VLA. This category of license does not include a home exception.
Found here: https://www.ni.com/en-us/support/documentation/supplemental/07/understanding-ni-software-policies.ht...
Also, depending on your application, you may be able to instead use the free "NI Modbus Library". It's not an official NI product, but it's available via the NI LabVIEW Tools Network. I have recently seen it used (within the last 6 months), and it seemed to do a good job. Here's a link to a description.
-joeorbob
