You can install from source, but only do this if you want to contribute new code to the module, and know what you are doing and why..
In fact, please never do this if you don't know exactly why you are doing this and that you definitely need it.
- Clone the repository.
- Install the ImportExcel module:
Install-Module ImportExcel
- Install the module:
.\InstallModule
- Import the CyCLI:
Import-Module CyCLI