How to install the Mono package in a wineskin app?
If memory serves, you can just delete the following file, and these dialogs will come up on the next run:

&lt;YOUR_APP_NAME&gt;.app/Contents/Resources/.update-timestamp


Of course, this dot file will be hidden by default and inside an application bundle, so it might be easiest to remove it by Terminal.

Otherwise, you could enable hidden files and right-click, browse contents to find it.