Thanks a lot for your answer. I did 3 installations and uninstallations and multiple reboots. No help.
removed every thing in my mac bearing the name evernote (using find any file) and re-installed it, nothing happened, so i uninstalled & left it. Today I tried again and the 1st install worked. SO no more probs. BUT I'm never going to touch helper options again. Just glad to get back my normal evernote, Thank You !!