No, you need neither an iLok USB dongle nor an iLok account to use our plug-ins. (Only if you want to activate them using iLok)
As of April 2022, you also don't have to install the PACE License Manager application in case you're not planning to use iLok based activation.
In case you need the PACE License Manager - you can download it from here:
https://ilok.com/#!license-manager