@megasxlr01
I figured it out. One of the folders in the zip file has two spaces where the script expects only one. The errormessage states that it expects the file C:\Users\megas\Downloads\CR-6 SE -source code V1.0.3.6\CR-6SE-Marlin-2.0.1- 20200916 - V1.0.3.6.pio\build\creality\FrameworkArduinoVariant\PeripheralPins.c' to exist. I bet that the file does exist but in this location:
C:\Users\megas\Downloads\CR-6 SE -source code V1.0.3.6\CR-6SE-Marlin-2.0.1- 20200916 - V1.0.3.6.pio\build\creality\FrameworkArduinoVariant\PeripheralPins.c'
The difference with the errormessage is very subtle. Look here:
this is the folder in the installation script:
C:\Users\megas\Downloads\CR-6 SE -source code V1.0.3.6
this is the folder on your harddrive
C:\Users\megas\Downloads\CR-6 SE -source code V1.0.3.6
If you remove one of the spaces between 'code' and 'V1.0.3.6' it should work.