RC (Release Candidate) version from E2Pdf.com can contain hot-fixes or fast improvements before release to WordPress.org, so if you need features or bug fixes which are listed on Changelog here and which were not added to "Stable" version from WordPress.org:
1. Enable update option at "E2Pdf" -> "Settings" -> "Release Candidate Builds" (Update from E2Pdf.com).
2. Check for updates at "Dashboard" -> "Updates". It must show E2Pdf new version from E2Pdf.com. Due WordPress cache it can appear with some delay.
3. Update plugin as usual.
If this option will remain "on" - plugin will use E2Pdf.com for future updates.