I want to install e(fx)clipse for Eclipse Neon, however eclipse is running on a machine that does not have internet access. Is there a way I can manually download a plugin and install it to eclipse?
To clarify: I have access to the internet on another machine that I can use to transfer files onto the machine with Eclipse.
you can download the update-site as a zip by modifying the update site adress last part by site_assembly.zip
example : Install URL becomes,
http://download.eclipse.org/efxclipse/updates-released/2.4.0/pluginName
http://download.eclipse.org/efxclipse/updates-released/2.4.0/pluginName_assembly.zip
change version number if you need an other one
and then use this zip to install your plug-in (Help > Install New Software > Add) as you do but instead of adding an update site url select zip and give the zip you download see this answer part 2 for screenshot :