This fixed my problem. You were correct that I was running Windows 10 Pro N. Thanks!

Hey all, Been running BI 4 on my Windows 10 computer. Microsoft just installed the May 2019 update on my system and suddenly BI 4 stopped running giving the error that WMASF.DLL was missing. https://ksshedbuilder.com/store/images/error2.jpg I downloaded BI 5 and installed it and it says WMVCore.DLL ...

Thanks for providing the link to the service pack from Microsoft so others could try to fix it too.