A network server license is a shared license. It allows one person to compile at a time. Once used, the license remains captured by that person for 60 minutes, during which no one else can use it. If that person compiles again, the 60 minutes starts over.
The license is not compatible with virtual machines. To use this license with a virtual machine, see SW006021-VM. For the single-user, workstation license, see SW006021-2.
The MPLAB XC8 is a full-featured, highly-optimized ANSI C compiler for the PIC^® 0/12/16/18 and AVR^® microcontroller families. This compiler integrates into Microchips MPLAB(R) X IDE, is compatible with all Microchip debuggers and emulators, and runs on Windows, Linux and Mac OS X. 
The MPLAB XC8 Compiler also comes with 12 months of High Priority Access, a maintenance subscription providing web access to new version releases and priority technical support for the compiler.

Click on link below to download XC compiler,

Link: https://www.microchip.com/mplab/compilers