Look on this thread:
http://forum.arcadecontrols.com/index.php?topic=83653.0
Sorry, but I need to critec on the thread (not mean to sound negative), but the pulling of the demo and not have a new one ready is now a bad move and you now & might become to losing some costumers.
You should get a new demo up soon, or the least have a v3 demo/full as "backup" to download, so users have a change to test your software, even it a version older.
Like you did for free version 2 (unsupported) and full version 3 (supported). I think this worked acutelly like fine. The v4 go exclusive for the registred.
But up to you :-)
NB. I wrote about the same typic in the Ebay thread, but I have removed for avoid writing about twice.