Think twice before allow this upgrade. On 8.0 everything worked great and smooth for me. After upgrade to 8.1 the running Windows are about twice slower than before, and what worse, Window are not able to connect to Internet anymore. None of the network option works, Windows always says "not internet access" or even not network connection. I reinstalled the vmware tools, restarted, rebooted...
I'm running Win 7, 64 bit freshly installed on freshly installed El Capitan on Mac Book Pro (not very fresh one...).
I hope I will not loose the license after reinstalling back the old 8.0 and no more upgrades, never more...