Hello there, I am having a hardtime to remove older DLLs in bin folder some old one need to be there, and some should not. These make some functions work, and some dont.... what would be your suggestions?

why can't the core dlls for each updates separate from the old one completely and different dir? So we know what to keep and what not?

Are there a trick to overcome this?

As Mike mentioned you just have to keep an eye out for this type of thing.  I personally have become all too familar with the respective .dll files, so I know which ones have to go away!

What errors are you getting?