It looks like they've cut off access to anything that isn't built against the latest version (3.4). Attached you'll find our plugins built against 3.4, however, these are not tested yet, so if you're going to try them, please try them against a test account.
The OEC live plugin recently stopped working for me. The live data screen is all zeroes for ES. Can anyone confirm if the plugin is or is not currently working? My personal OEC plugin also stopped working (wouldn't connect) until I updated to the newest API dlls version 3.4.0.