Can I register Foxit PDF IFilter 3.0 with the license key of version 2.X? Help Center June 02, 2021 08:34 Updated Follow No, Foxit have upgraded the license mechanism. Please contact us to upgrade your license key or purchase a new one for Foxit PDF Ifilter 3.0. Related articles How to activate or register Foxit PDF IFilter? Activation Error Code for Foxit PDF Editor and Quick Fix How to deactivate the perpetual license from previous installation and activate on new device? Where is the license information of Foxit PDF Editor? How to enable Foxit PDF IFilter log? Comments 0 comments Please sign in to leave a comment.