MPLAB X v5.35 does not include the XC8, XC16, or XC32 compilers. You must download the matching compiler version separately from the same archive. If your legacy code was written for XC8 v1.41, download that specific compiler version, not the latest v2.36.

Why I Went Back: Downloading MPLAB X IDE v5.35 for Legacy PIC Projects

Recently, I needed to resurrect an older project built around a PIC18F series microcontroller. The code relied on a specific compiler optimization flag and a third-party plugin that simply hasn't been updated for the newer versions of MPLAB X. Every time I tried to build it in v6.15, I was met with a wall of deprecation warnings and broken dependencies.

The solution? Rolling back to .

Probably not. Stick with v6.x for the latest device packs and debugging features.

There is a certain comfort in stability. While Microchip continuously pushes out updates to MPLAB X IDE (now well into version 6.x), sometimes the latest and greatest isn't what you actually need.

If you find yourself in a similar situation—supporting legacy hardware, using older compilers (like XC8 v1.45), or just preferring the pre-"Modern UI" layout—here is how to grab that specific version. Unlike some vendors who scrub older versions from the internet, Microchip maintains a very useful archive. You do not need to use shady third-party download sites.