To understand the value of MPLAB C18 v3.47, one must understand the licensing model Microchip used at the time. Unlike modern compilers which usually have "Free" and "Pro" modes, the C18 compiler was sold in distinct tiers:
If you are running a modern OS (Windows 10/11), C18 may have installation issues. It was designed for Windows XP and 7. If the installer fails, try: Running the installer in for Windows 7. mplab c18 347 full version best
Because Microchip has deprecated this software, installing it on Windows 10 or 11 requires specific steps. Here is how to achieve the best setup. To understand the value of MPLAB C18 v3
: It works best on Windows 7 but can be installed on Windows 10 with careful configuration . mplab c18 347 full version best