We stopped supporting iLok a few years ago. However, you can put your licenses on a standard USB stick if you'd like a portable "license dongle."
To authorize a USB thumb drive, make sure your USB drive is in your computer. Then, open one of your plugins in ProTools (or any host) and click the key icon on the bottom right side of the plugin window. An authorization window will pop up. Under the text "Select the device you would like to activate" there is a pulldown menu. Click it and select your USB drive. Make sure the "Activate all my licenses" checkbox is checked (unless you want to authorize individual plugins one at a time). Then click "I'm Online" and enter your login info. Now your USB drive is authorized and can be used on any computer.
For more info on our authorization process, please check out the Activation Manual.