What step do I need to take to add/update merge modules on a standalone build engine we have that does not have a licensed GUI, just the command line builder.
If I am not mistaken, SAB (standalone build) installer does not include merge modules, which will have to be downloaded separately after the fact. What I did was manually copying merge modules from my dev box to SAB machine, and specify the merge module location with -o switch. If there are multiple SAB machines, instead of maintaining multiple copies of the same merge modules, alternatively you can copy merge modules to a network share where the dedicated build user would have access to from those SAB machines. However, build could be slower since merge modules are on a network share.
If you have InstallShield installed, merge modules will have been installed on the machine. Also, Microsoft Visual Studio would install some too. That's how I got the merge modules for SAB machines. Alternatively, you can log on to Flexera's Product and License Center, and there would be links to available redistributables for versions you are licensed for.
