For those running both versions- Legacy and the latest- a note of caution. I closed v10 and installed the Legacy version. Unbeknownst to me, v10 was still running (as a process) as I opened the Legacy version. After a couple of hours my Win10 system slowed to a crawl and, upon checking Task Manager, was shocked to see the closed version of Evernote (v10) consuming over 32GB (I have a 64GB system) of RAM and my system was pegged at 99% Memory usage.
I then attempted to close the offending Evernote process and my system crashed.
I've rebooted and things seem to be ok. I've ensured v10 isn't loading at startup and will continue to monitor as I run EN Legacy.