Originally Posted by marcostt
But what I have noted it is that I can not open an epub, when I try to open an epub dont maked by sigil, the program crashes
If the epub you're opening was made with calibre, that issue has been fixed and will be in the next release. The bug was not in Sigil however, but in zip modules Calibre uses. I implemented a workaround so it shouldn't be a problem any more.