All the old stuff still works in the newer releases. Just because you /can/ do GUI doesn't mean that you have to
It is actually pretty easy to get a v6 like experience with OpenEdge 10. Just open a "proenv" window and it will be just like the good old days. Type "pro" to start a single user session with the tram lines. etc.
(Ok, as shipped proenv is slightly broken -- it thinks your screen has 300 lines but it only displays 24 -- that puts all the prompts and messages out of view... to fix that click on the icon in the upper left of the window, choose "properties", then choose "layout". Change the
both height values to something more reasonable -- I usually go with 48 lines and I often change the width to 132. But I have fairly big monitors (24"). Lastly click "ok" and "apply changes to startup shortcut" or some such thing if prompted.)
You won't be able to buy v6. I don't think you can buy v9 any more either -- APs can still sell it with an application but I don't think they're selling development licenses for it any more.