Hi Terry, et al
thx 1M for your effort helping me!
The package's name "MODULE_GRBL13.2" in library.properties should be "MODULE_GRBL_13.2" (underline instead of space before 13.2).
- download M5Stack
- unzip it
- edit file "library.properties", line to "depends=M5Family,M5Module-4Relay,MODULE_GRBL_13.2,M5_BMM150"
- zip it and install zipped library
- restart IDE
- update now performed flawless
@m5stack: awaiting M5Stack (0.4.6) to be released soon, as not all users having the knowledge on how to apply this "patch".