Let’s be realistic. Microchip will eventually stop signing drivers for v5.35 on Windows 13 or macOS 20. However, the "top download" status of v5.35 will likely persist for another 5–7 years.

v5.35 is the last version that includes the MPASM assembler . Versions 5.40 and later replaced it with the PIC Assembler, which is not fully backward compatible and can cause significant build errors for older .asm projects.

If you download from any source, verify using checksums. Official checksums for v5.35 (example for Windows):

Beyond the assembler, version 5.35 is remembered for its relative stability on older operating systems. It was built during a period where the transition to 64-bit architecture was fully realized, yet it didn't have the higher system requirements of the most recent iterations. For many developers using older workstations or specific hardware debuggers (like the PICkit 3 or ICD 3) that sometimes face "finicky" behavior in the latest software, v5.35 offers a reliable, middle-ground environment. Conclusion: Why It Still Matters

Go to www.microchip.com and search for "MPLAB X IDE Archives."

: It provides a single graphical user interface for developing across Microchip’s entire portfolio, including 8-bit, 16-bit, and 32-bit PIC® MCUs, as well as AVR® and SAM devices.