The annoying pop-up is because of the way RailMaster and its drivers were written for XP. It raises this annying message because you have to run it as an Administrator (my shortcut does this for me). If I use the other software to control my layout with the Elite it just works (I still prefer RailMaster design though).
You can disable User Account Control but if you search on how to do this you won't find anything from Microsoft as this feature is trying to make your PC secure. I do have it turned off but I am super careful about what I install and where I get software from.
On a seperate not I have moved RailMaster and the Pro pack between several win 10 machines with no issue - and I now have a 23" touch screen all in one PC specifically to control my loft layout.