Go to the official Microchip Technology Archive page.
The decision to stick with MPLAB 5.35 download versus moving to v5.45 / v5.50 / v6.00 depends on your constraints:
Version 5.35 changed power supply configurations for some debuggers. In IPE v5.35 and later, the ability to configure power supply settings for PICkit3 was removed, necessitating an external power source for the target board.
Because it is an archived version, you won't find it on the main MPLAB X download page . Instead, you must navigate to the official archives: Visit the Archive : Go to the MPLAB Ecosystem Downloads Archive Locate the IDE : Scroll to the "MPLAB X IDE" section. Choose Your OS
The Ultimate Guide to MPLAB X IDE 5.35: Why You Need It and How to Download It
Older hardware programmers and debuggers, including the original and PICkit 3 , see full, uncompromised native support in v5.35. While newer software versions deprecate or completely drop connection protocols for these tools to prioritize newer hardware like the MPLAB Snap or PICkit 4, version 5.35 treats them as primary development assets. Step-by-Step Guide to the MPLAB 5.35 Download
Click the direct download link to start downloading the package to your local drive. The file size is roughly 1 GB, so a stable internet connection is recommended. Installation Process and Best Practices