I found this on their page: What if I purchased VMware Fusion 4 before July 25th, 2012? Customers who purchased VMware Fusion 4 before July 25th, 2012

I found this on their page: What if I purchased VMware Fusion 4 before July 25th, 2012? Customers who purchased VMware Fusion 4 before July 25th, 2012 can upgrade to VMware Fusion 5 Professional for 50% off the regular price or buy a full license of VMware Fusion 5.