I am downloading visual Studio Community 2015 offline
and it stuck at almost 99% for about 4 hours by now.
I am downloading offline installer using cmd command <executable name> /layout
Just Wait.
I had this exact problem. While the installer was hanging, I checked in the task manager and saw that the vs_community.exe
process seemed to be active (Memory and CPU usage were fluctuating). So I left the computer on overnight, and in the morning, it had finished the install.