MPLAB X IDE v5.35 is highly sought after because it is the final version to support the MPASM assembler, making it essential for maintaining older projects. While Microchip does not provide an official "portable" version, the software is cross-platform and can be found in the MPLAB Ecosystem Downloads Archive. Key Features of MPLAB X IDE v5.35
Features of MPLAB X IDE v5.35
Appendix: Example launcher batch (Windows)
Official Download: Navigate to the Microchip Archive and look for the "MPLAB X IDE v5.35" entry.
Locate the mplab_ide.conf file within the etc folder of your extracted directory. Open it with a text editor. Find the lines for default_userdir and default_cachedir.