Hello,
The very latest SDK for QBD is 13.0 and it works well for any QBD platforms and versions. It is a bit complicate if using Visual Basic, but I have been able to do this in the past. So you would need the event trigger only and a simple pop-up dialog? I have my own QBD Enterprise Solution 2018 for the development. But, I have VS 2010 and 2019, so probably using 2010 would be better if you would upgrade the solution to your VS 2015.
Let me know your response.
Best Regards
Khamid