Using Windows7 PRO 64-bit on a laptop I installed MPLABX v5.10, MCC30 v3.31, ASM30 v3.31, XC16 v1.61.
With MPLABX v5.10 created a new project added my main.c file.
Checked that all the tool chains are recognized by MPLABX, see attached screen shot.
The project builds and simulates correctly.
I can see a difference between the screen shot in your post#7 and mine.
There is a green dot next to the C30 tool chain selector in mine that is missing from yours.
From other issues I have raised with Microchip I have learned that MPLABX will try to execute some application in the tool chain installation folder before it will allow that tool chain to be used by a project.
Now comes some speculation on my part as to what your problem is and what you could do about it.
Windows has some odd behavior with old applications installed in the "C:\Program Files" and "C:\Program Files (x86)" folders.
The Microchip tool chains have some issues when paths names have spaces in them.
What I do to avoid these issues is to install all Microchip development tools on custom paths and never use spaces in any folder or file names.
This does make setting up MPLABX harder. MPLABX will not automatically find where you installed the tool chains. You will need to register each one manually with the IDE.
post edited by dan1138 - 2021/01/17 11:41:17