Can I upgrade my VMware 6.0.3 without losing my data? I already upgraded to Yosemite
I know that when I upgraded VMWare to 7.0 after my Yosemite 10.10 upgrade I did not experience any problem with loss of data in my VMs.  After upgrading VMWare, the app did reconfigure the .vmwaremv files, but after that everything was the same.

I do not store data exterior to the VMs and I think that all my data is within the .vmwarevm itself.  Like the other user pointed out, contact VMWare to be sure.  Hope this helps.  Just my experience is all...