So I have been unsuccessfully trying to install a plugin for ImageJ for a couple of days now and nothing seems to be working.

Does anyone know if Mac offers any kind of tech support center that could help me?

I'm vaguely familiar with the program, I'm assuming you're in an medical image processing course? UTS deals with tech matters but your prof should be the nest source of info. ImageJ base install should go smoothly, so I'm assuming you're looking for more advanced features or are running on an unsupported OS.

I am doing my thesis and need the plugin to do some data analysis. I have installed other plugins before and haven't had a problem, so I'm not sure what to try from here. Would UTS be able to help with this?

Generally, unlikely, but there are quite a few clever CS people on the UTS team and they likely know somebody who has experience with tackling that sort of problem. Try emailing them first asking to forward it to a colleague who might know, if not urgent. Or contact profs or grad students in image processing. Assuming you've exhausted googling... I believe ImageJ or something similar is on the IAHS computers, but that was a while ago I've been around those machines.