Question: how to connect logitech keyboard without unifying software?
Answer: Launch the Logitech Unifying Multi-Connect Utility. This is available once you have downloaded the Logitech unifying utility. ... 
Plug in unifying receiver. ... 
Configure. ... 
Exit. ... 
It saves on money. ... 
Saves on space. ... 
Reliable software updates. ... 
Allows connectivity of multiple devices.