This post sums up the current solutions available.
A fix is now in place so that the problem shouldn't occur anymore.
the latest F-Secure products should all support Yosemite. If you're still having problems, please contact support through this form: https://www.f-secure.com/en/web/home_global/support/support-request - attach the output of Support Tool so that we can diagnose the problem. Your description of the problem "client still shows as unregistered" suggests that this may be a different issue from the real-time scanning problems related to Yosemite upgrades.
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