Epik didn’t crash your site, you most likely have other issues. There are no other reports of this happening, so you probably have something installed on your WP installation which is conflicting with other things.
Epik won’t prevent any plugins from installing, there is no code inside of it that will do that.
We would definitely need more information to know what’s going on, but I can assure you that Epik is not causing your issues. Do you have a link to your site?