I’ve been using Libre Office for years. This morning it refused to open. Clicking the icon, clicking an associated file, clicking any other associated files, selecting [safe mode] from the Win10 start menu. A few seconds of spinning then zilch. I had version 6.8. I last used it about 9 hours before it failed. I downloaded and installed the latest version from their website figuring Windows broke something. Same thing with the update.
Win10 Pro v20H2 build 19042.867 updated on 3/30/21