Thanks for the info. For now, I'll uninstall it and try to get by with the windows version. The machine is a fairly powerful i7 laptop that I use for software development and CAD and has a lot of useful life left. Lenovo doesn't recommend upgrading it to Win10 and I never needed to. Evernote is the only program I use that doesn't support Win8.1 and, ironically, this is the machine I use Evernote on the most. It has been working fine until the latest version. If the web version doesn't work out I'll just move on. Installing an old version seems like a temporary solution.
EDIT: second sentence should have read, "For now, I'll uninstall it and try to get by with the web version."