The latest version requires me to delete WorldCore-universal-1.6.4-1.1.3.4.jar everytime I start minecraft, or else it crashes with this:

https://privatepaste.com/838b3d4eed
https://privatepaste.com/8ebc592c36
https://privatepaste.com/2dc81839a5

Fixed

Did you? I dunno. I had to delete, like I said, then I updated to the latest build, and now BoP doesn't download the WorldCore.jar and thus MC doesn't start.

Need to re-open it. Latest version (BiomesOPlenty-universal-1.6.4-1.1.3.226) downloads WorldCore-universal-1.6.4-1.1.0.5.jar just fine, but still needs re-deletion after each MC start.

Crashes otherwise with the same error as above.