In Microchip MPLAB IDE 8.92, “Microchip PIC32 C-Compiler toolsuite” were not showing. If that is the case, you just have to click t he checkbox “Show all installed toolsuits”.
Here is t he complete list of compilers
This is what you see if you dont check the checkbox
There is a related topic on microship site where the suggestion is that you need to register the DLL but here you don\t have to do that.
The reason C32 compiler is now showing up could be because the right microcontroller is not selected (it does not support C32). There is a bug in MPLAB, if you select MX32 bit microcontroller in the first project, it selects the default 8-bit micrcontroller instead, hence 32 bit options are not showing by default.