Hi Eli,
the thread title is a ltlle bit confusing as the original poster had an issue with installing this tool "SAP R/3 Connector for Eclipse" which is not the SAP Java Connector (SAP JCo) itself.
This "SAP Connector for Eclipse" tool is not from SAP.
The project's homepage seems to be http://rcer.sourceforge.net
As no one was able to help here within the last year, I'd suggest that you drop a note to the author as proposed in the project website's FAQ section. Maybe the author would post his reply here as well.
Best regards,
Stefan