I had this problem for a bit on Windows 10. What you want to do is go into "Settings" > "Devices" > "Bluetooth & Other Devices". On the right hand side under "related settings", click on "Devices on Printers". On the top left corner, click "Add a device". As it searches for devices, go ahead and turn on your keyboard (mine is a T300 CHI) and put it into pairing mode. Once device appears, click on it. When and if it requests a pin, click the option under the pin input. From here, an on-screen pin should appear which it requests that you enter into the keyboard directly and submit by pressing enter. Once that's done, your computer should have connected to the keyboard and begun installing its drivers. Once drivers are installed, you should be good to go!