So what I see, on the last one for exemple, is that you ask it to just take what is inside the folder Alabama.
Now as the exporter sees it in this folder, by default, there is no *.adf files only folders.
What I believe you should type:
avcexport E:\Downloads\E00Data\adf_database\coverages\Alabama\[b]aepoint[/b] E:\E00Data\Alabama\aepoint.[b]E00[/b]
Make sure the first path - where it looks for the *.adf - is the parent folder of said *.adf, in your case \aepoint .
Also that the second path - where it will export in *.e00 - is ended with the file extension, in your case \aepoint.e00 .