Suppose you have the latest version of PhantomPDF installed on your computer. If not, download it from Foxit official download center.
Open PhantomPDF, choose Activate
Then click the Sign In.
3.Or you could click the Back to Express.
Click on Help >Activate, enter your Foxit account that you used to purchase the subscription to sign in. Click on OK to accept the confirmation message " You have successfully registered your formal license key. Then click on OK in the restart confirmation message to restart Foxit PhanotmPDF.
Once your subscription is activated, you can go to Help > Manage to manage your authorized machines or change subscription.
You can also go to Help > About Foxit PhantomPDF > License Information, to check licensing details, like renewal date and license modules.