Is there any way to download and install ei capitan offline? Now i'm having yosemite in my mac and I've been trying to update my mac from yesterday.My wifi has some problem so it might be the problem to download ei capitan it disconnect each and every time when i resumed it.Finally it starts from beginning. So I'm planning to download it through offline. Please anyone shed some light on this question
Yes.


Download the installer you want and then disconnect from all networks.
Use that installer to make a USB drive that boots and installs the OS.