Sorry for my reply. I am only an F-Secure user (their home solutions).
Should be possible to do so by next steps:
-> to login with your credentials at My F-Secure portal:
-> then to choose "Add device/Install" and get installer with further common installations steps.
There are Knowledgebase articles about installation flow:
Your F-Secure SAFE subscription is still valid but might have been accidetally removed during an upgrade or by another conflicting antivirus.