I have just upgraded from Windows 8.1, where SD Light worked beautifully via Internet Explorer 11, to Windows 10. This replaces IE with a web browser called Edge. I find that SD Light won't run; when I connect to the website, I get a message telling me I have to install Silverlight. I can only get past this by agreeing to download and install Silverlight. Eventually, Windows reports what I already knew - that it is on the PC already - and then dumps me back to the original screen telling me that I need Silverlight . . .
I have found in the past that Chrome is an excellent alternative browser, and I have no trouble in running SD light using it. This will certainly do as a solution for me until the incompatibility with Edge is resolved - by whom, I have no idea!