I installed Windows 10 on my Mac mini (with Parallel Desktop 10 for Mac). In Windows 10, I tried to use Small Basic v1.1.
Though Title bar became white and new window frame is thin, Small Basic v1.1 runs well in Windows 10.
But new browser Microsoft Edge no longer supports Silverlight. So recommended browser for Small Basic in Windows 10 is Firefox.
I found an another solution in Microsoft Edge. Microsoft Edge has a menu "Open with Internet Explorer". From this menu, you can start IE 11. Internet Explorer can run Small Basic program with Silverlight.