: Type or paste your registration key into the box and click Activate .
C:\Program Files\Foxit Software\Foxit PhantomPDF\ – change if needed.| Issue | Likely Cause | Solution | |-------|--------------|----------| | “Invalid license key” | Typo or wrong product version | Re-enter carefully; ensure key is for PhantomPDF 101, not a newer version. | | “Activation limit reached” | Key used on too many devices | Deactivate on an old PC via , or contact Foxit support. | | “No internet connection” | Firewall blocking Foxit | Temporarily disable firewall/antivirus or use offline activation. | | “Product already activated” | Another installation uses same key | Deactivate previous install first. | foxit phantompdf 101 activation key install