Lack of Progress Bar plugin for Eclipse says the best way to get help with its software is by sending email to its mailing list at lopb-discuss@lists.sourceforge.net.
Other Ways Of Getting Help
Here are some other places where you can look for information about this project.
Project Homepage
The project has a homepage which can be found at http://lopb.org.
Project Mailing Lists
lopb-announce - One-way broadcasts and announcements from lopb to the community. (Archive)
lopb-discuss - Discuss lopb, request feature enhancements, report bugs, and get support. (Archive)