I was under the assumption that it was just a build thing but I have no experience with the engine itself
Viewing post in Caliross, The Shapeshifter's Legacy comments
In theory, you just need to check a box to add the RTP files when you run the program to "package" a release, but in practice it takes time to package and upload the version (and then to extract it from the exe and then back into an archive to have that version also available). It's not a huge amount of time, but since I still want the version that doesn't include the RTP, I'd be doubling the time needed, and that adds up.
Plus, there is always the chance that a bug exists in one version but not the other (from random stuff like a corrupted file or error when creating the package, to some mistake when I copy rename the files or an issue with the upload). Even if it's a low chance, I really don't want to bother with the extra hassle, until I am sure it won't be a recurring commitment.