to upload the latest MicroGranny software install this library - bastlMicrogranny to your Arduino/libraries also install the SDFat library https://github.com/greiman/SdFat
open microGranny2_5 from examples folder of bastlMicrogranny library select Arduino Uno and the right serial port before uploading
comment: on may 2022, i installed this fork of the library https://github.com/weskoop/SdFat_bastlMicroGranny on my machine, instead of the greidman original one.