Yes, I've tried an uninstall and reinstall. Trust me, I've tried all troubleshooting that I can think of - I'm a computer technician, so I've pretty much tried everything before asking for help.
The Web IDE "opens", but I can't use it, as non-Canary Chrome does not support Web BLE yet.
Espruino is a JavaScript interpreter for low-power Microcontrollers. This site is both a support community for Espruino and a place to share what you are working on.
That appears to be the latest release.
http://www.espruino.com/Web+IDE
As this is Win10, have you tried a full un-install and attempted a re-install?
Settings >> Apps >> Apps and Features :: Un-install
Might provide a clue by going through that process.
This might not be the version you are after, but does the online WebIDE become functional on launch?
https://www.espruino.com/ide/