Used to love it and now it doesn’t work

This was my go-to app for emails from an important client. With the new update for the computer (El Capitian) it crashes on launch EVERY TIME. I have updated it to the newest version, up to date on all updates but it still crashes. I have consulted the website and it doesn’t help me at all. I would like to use this but it doesn’t appear to want to work. If it worked I’d give it 5 starts but because it just crashes I can’t do that. HELP!!

melPAI about WinDat Opener