Upgrade to ...nothing

I have opened emclient and was suggested to download and install new update. I have agreed. After some procedures it asked for reboot. I rebooted. Then the emclient icon was not on the taskbar. I clicked on the emclient program from start menu… Does not open. Downloaded the install exe and run it. It didn’t repair the install as it showed “the account exist already”.
What should I do?
How can I retrieve my email database?
The program does not start at all.