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Cannot complete the install because one or more required items could not be found.
Software currently installed: Shared profile 184.108.40.2068936852036 (SharedProfile_epp.package.java 220.127.116.118936852036) Missing requirement: Shared profile 18.104.22.1688936852036 (SharedProfile_epp.package.java 22.214.171.1248936852036) requires 'org.maven.ide.eclipse [126.96.36.19910607-2117]' but it could not be found
Hopefully this post will come up when a user heads to Google with the error code. Anyway, the fix is as simple as running Eclipse in administrator mode. If you're not familiar with how then you simply right click and select run as administrator and a dialog will pop-up asking to continue (of course you want to!). You should now be able to install a plugin through the automated ways in Eclipse like the Marketplace. Do note that you need to run as administrator every time you want to install a plugin.
I'm not sure if a different error code would show to a similar problem but this only comes up when I try to install plugins.
Hope that helps!