Evernote Update downloads the update msi file into a temporary folder, and installs it from there. The installer does not save itself to a safe place either. This means, when you want to uninstall or update, chances are that the file won't be there. It is then impossible to uninstall evernote from the Windows control panel too.
Evernote people:
1) Don't use a temporary folder for long-term storage of the msi file
2) Please tell us where we can find the previous installers on the web, else I remain stuck with 6.7.5
Thanks, Csaba
PS: I have Win7.