Posted 13 October 2020, 9:15 pm ESTWith VB6.0 SP6 in two developer machines(Win7 and Win Server2008 R2), Both of these can reproduce the problem.
When I drag Flexgrid (vsFlex8.ocx) to the form, the trial window will pop up
I deleted this control and added it to form again. There is no pop-up window, but when I run and close form, the pop-up window appears again
I have referred to below blog to check computers
No other versions or third-party controls are installed
I noticed that the blog mentioned that license can be deleted through C1LicBomb.zip, but the file could not be downloaded