The attitude of immediately saying that they didn't work and saying that there are files missing. And on top of that, demand the reversal of credits. That's an ostentatious attitude. If he doesn't know how to install. How will he tell you that files are missing? Strange?I do not think support from person who share resource is required. If resource works and has been tested then it is nice for them to make effort to help but is NOT MANDATORY. You community should support each other. As @Kenxo say, other members should also help but they not required either. If all members claim not work then admin will look. If it is me, I will test, other admin or mods may not.
In the PM, I made it clear that I would notify the ADMs for this attitude of his.