Missing Plugin GWT error in Eclipse - java

I'm trying to run an existing GWT project in Eclipse as a Web Application. This runs on other people's PCs, and I used a setup document common to us all to install Eclipse and GWT. I consistently got the error:
Google Error
Not Found
The requested URL /missing-plugin/ was not found on this server.
So far, I have verified that the GWT SDK is installed, and that the Google Plugin for Eclipse 3.5 is installed. I uninstalled just the Google Plugin, and then everything Google, and reinstalled, with no luck. at this point, after poking around a lot, all the Google stuff is installed, but the "Run as Web Application" option is completely gone. I've googled this, but no luck so far.
Any ideas?

As of GWT 2 (or there about), a new browser plugin is required for developer mode. You can get it here: http://gwt.google.com/samples/MissingPlugin/MissingPlugin.html

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I started learning GWT and wrote a sample app in Eclipse. I then said "Run on server". It gave me a URL to open and I opened that in Chrome. I saw a prompt asking me to install the GWT Developer Plugin and gave me a link. But I don't see any button to "Install". Is this some cruel joke from Google? What am I supposed to do now? How do I run the app? Eclipse only gives me this link which in turn gives me a prompt to install the plugin which I can't. On Firefox, it says version 29 not supported. What the hell is going on?
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The reason why it doesn't work anymore can be found in a post by Brian Slesinsky.
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Use FF 26 (this can cause potential security problems)
Use FF ESR version (currently based on FF 24) that is typically used by Companies
Use Super Dev Mode
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Try this URL for Installing GWT Missing Plugin.
For more info have a look at my another post GWT Developer plugin for Chrome and Internet Explorer
Click on plugins for other systems to get more GWT Developer plugins.

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I have set up my computer with windows 8.1 completely new (formatted), to be sure to have a working system.
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install JDK
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install android SDK-plugins in eclipse
in android sdk: install all extras, API 19, in tools: Android SDK Tools, Android SDK-Platform Tools, Android SDK Build Tools (only newest, 19.0.3)
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You are very thorough, which is good. Your development installation appears to have flaws, and you might be trying to make it run before you have seen it walk. You need to divide and conquer the potential problems. Initially simplify what you aim to create.
To pinpoint the errors, try the two standard tutorials before starting on your own design: first build and deploy an AppEngine project without Android components, and only after that works, build and deploy an Android to AppEngine project. Somewhere along that process your errors will show up, and then you should have a more specific piece of source code to show and discuss in this question.
Yesterday, a new version of Android SDK (22.6.2) was released. Apparently, the problem with RegisterActivity was solved in this update. Now I can create an Appengine connected Android Project without any errors!

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You can attach android source code from Android SDK manager. Just check the option for Source for Android SDK option or using this plugin for Eclipse adt-addons

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