From the build 1.6.1922.x, all add-ins projects are signed to allow localizing. The sign key file TeraDP.snk is provided in the GN4SystemAddins.zip.

Your existing custom projects (FredCustomAddInExpress etc) are of couse not signed so you will have to sign them manually. See below for the procedure.

If a project is not signed, there appears a compilation error:

Unable to emit assembly: Referenced assembly xxxxx does not have a strong name.

Sign a project manually

1.Extract the TeraDP.snk file from the GN4SystemAddins.zip file and store in the GNAddins folder:

2.Right-click each custom project, one-by-one, and select Properties.

3.On the Signing tab, select Sign the assembly and then in Choose a strong name key file, select the TeraDP.snk file.

4.Save projects.