The version https://www.nuget.org/packages/Trirand.jqGrid/4.6.0 is definitively free. See

You can download jqGrid 4.7.0 from here too. The code is published under "Dual licensed under the MIT and GPL licenses". See the first lines of the file jquery.jqGrid.min.js and the comments at the beginning of every JavaScript file included in the package. The version is not published on NuGet.
There are some forks of the last free version of jqGrid. See for example my fork, this one or another. I have fixed already (in my fork) many bugs existing in the last free version of jqGrid. I have implemented many new features too. I think that I and other developers will cooperate together to continue developing of free version of jqGrid.
I plan to release the currently developing version soon (probably already in January). I will publish it on NuGet and other common known free repositories.