Hello,
I found this video, where a gentleman very clearly explains how to add a custom plugin to your project (starting from 1:35):
I did those exact steps, using those exact files (which you can download here: Razer Hydra Plugin - C++ - Unreal Engine Forums), but on a mac, not a windows.
The response I get from the editor is this:
And then the editor just closes. I really need to add a custom plugin, can somebody please help me ?
Thank you.
The download doesn’t include Mac version of the plugin, I’m afraid. I took a quick look at its source code and it seems that building a Mac version should be possible, but you’d need access to Sixense SDK for Mac… I’ll try to contact the author of the plugin and offer my help with creating Mac build.
Thank you, but that’s not the actual plugin I need. I used that tutorial, only to learn how to add new plugins.
The one that I actually need is this one:
VaRest allows us to make http requests from blueprint.
But I had the same problem with VaRest: “Plugin ‘VaRest’ failed to load…”.
And it’s a bit surprising to me that a plugin needs two separate versions for mac and windows (I didn’t knew that, sorry), because I once transferred an entire UE4 project from mac to windows and it worked without any change whatsoever. So I figured if a project works, of course the module works. 
Thanks again for your reply.
Plugins are written in C++, so they need to be compiled separately for Mac and Windows. Let me take a look at this VaRest plugin. If it doesn’t use any Windows specific code, it should not be hard to make a Mac version. I’ll get back to you when I know more.
Ok, I really appreciate you taking the time to do this, and I’m sure other people will too, because the ability to make http requests from blueprint is something big, I think. 
Any update on this? VaRest would be extremely helpful to have for my Mac-based project, but I can’t find any documentation on recompiling for Mac.
Hey shawmakesmusic,
Michael has not had the time to look into that particular plugin yet, but I have reminded him. He or I will let you know if there’s any update. In the meantime, contacting the plugin’s author and requesting a Mac compile may yield results. Thanks for your patience!
Any update on this process in general? Im finding many mac plugins come up with this error, even ones that claim to be accepted on iOS