Unable to install 'eland[pytorch]' on Windows

I would like to import custom ML models to Elasticsearch, thus am using Eland to do it. However, to import custom ML models, I am to use eland_import_hub_model command which requires me to install pytorch using python -m pip 'install eland[pytorch]' . However I got an error saying- ERROR: Invalid requirement: "'eland[pytorch]'"

May i know what is causing this issue?