Just curious as to your reason's for wanting a deprecated version of ADM on top of a deprecated/abandoned GUI for it.
I run V2.5 alongside V2.6 to give me the choice of editing with a frame based or time based model.
If I want fancier editing with older video codecs - I go for V2.5.
If I want to edit with current video codecs - Only V2.6 can do it properly.
Looking at other video editors will most likely point you to expensive commercial video editors.