I have a good old mac with Mavericks and KM ver. 6. Will it happily accept importing macroes created in KM 8.1?
“Keyboard Maestro 8 for OS X 10.10+ (including Mojave).”
Ooops. Ok! Kind of understandable in a way. I guess there are many new functions in 8 which are not supported in older versions.
Can your machine handle El Capitan?
That's the best version of macOS in the last few years, and it will operate Keyboard Maestro 8.
I am not sure if it would be "happy" in El Capitan, being a MBpro Late 2008 with 8 GB?