Personal licenses (previously called "single-user" licenses) can only be activated on 3 machines, so to activate it on a 4th machine you will have to release the license from one of the existing machines. This can be done under the “Help” menu in Geneious 6.0 and later and under the “Pro” menu in earlier versions. You cannot release a license more than twice in 6 months. This is to prevent personal licenses being shared by multiple users.
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