dapriett,
You can download the all-in-one installer from the download site – http://myeclipseide.com/index.php?name=Downloads&req=viewsdownload&sid=36 and run the .exe on the workstation without internet access. Alternatively, you need to download Eclipse 3.5.1 classic from Eclipse download site. Download MyEclipse Archived update Site from MyEclipse download site mentioned above and add this as a local site to base classic eclipse.
To disable maven, open MyEclipse IDE, from menu options click on Window > Preferences > MyEclipse > Maven4MyEclipse and uncheck the checkbox for “Enable Maven4MyEclipse features. Click [Apply] and [OK]. Maven will be disabled.