You got your alert about Fusion 6 from your Mac's internet connection, from the running Fusion 4. While the VM may not connect to the internet, if the Mac can connect, that OS is what's running F...
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You got your alert about Fusion 6 from your Mac's internet connection, from the running Fusion 4. While the VM may not connect to the internet, if the Mac can connect, that OS is what's running Fusion, and thus can tell you. For internet connections, you may have to opt for Bridged networking (share the Mac's connection instead of having the VM be a separate "machine" on the network. I can't say for certain if Fusion 4 will continue to work in Mavericks. I know that Fusion 5 worked okay, but Mavericks is really overtaking things. How old is the MacBook? My mid-2010 MBP ran Fusion 3, 4, 5, 6, upgrading the MacOS X each time as available, but also Fusion every time a new version came out. For awhile, Fusion 5 was working better in Mavericks than 6 but there was a release 6.0.2 which helped quite a bit (not everything). In Mavericks, there is the "Prevent App Nap" option. Highlight the application icon in the Finder, choose "Get Info" (File menu), or command-I, or right-click and find it there. You can check this box to attempt to get Mavericks to "behave". But its core technologies are built around improving battery life, although it does it better on the newer Macs than the older ones...same for Fusion, it would seem.