Same here. Sorry, not very helpful. But I’d be interested in knowing why things are not working.
I’m not the developer, just a fellow-user, so I can’t solve your first problem. (Which is obviously the more important one.)
But the second one is easy. You can customise the response e-mail. You need to edit stageshow_EMail.php, which can be found in wp-content\plugins\stageshowplus\templates\. (Or …\stageshow\templates\ for the free version.)
To judge from the write-up it sounds excellent.
For our current show I have had to use an alternative “event booking” solution (one less adapted to theatre performances, but which is proving adequate). But I look forward to trying out StageShow+ in due course.
(PS I’m the same member as “Tagora” above, just logged in under a different user name.)