This was also posted on Piazza:
If you are having trouble installing the Aptana Eclipse plugin:
One thing you can do is download and install a fresh version of Eclipse (no need to uninstall the old one unless you want to, just unzip the new one in a different folder), and install Aptana Studio in that one, One student had to click the "available software sites" link from the "Install software" dialog, and enter the Aptana URL there, rather than in the main dialog.
You could also try installing the standalone version of Aptana.
Here is something that worked for a student in my office today: http://stackoverflow.com/questions/26077296/an-internal-error-occurred-during-loading-bundle
If you need help, feel free to stop in at my office Tuesday or Wednesday; I will demo simple uses of Aptana in Thursday's class.
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