Since I'm preparing to update from Fusion 8.1 to 8.5.6 to get the security improvements and have been testing the update on a clone of my Yosmite boot disk, I tested reclaiming disk space on Windows VM's from XP to Win 10. I only got the Internal Error message on XP but I routinely get that currently on Fusion 8.1 too. While annoying, disk space is reclaimed and the VM isn't damaged.
However, VMware Tools is automatically updated in Windows VM's but has to be manually updated in OS X VM's. And while that's worked for earlier OS X guests, when I tried to manually update Tools in a Mac OS 10.11 VM, I got the message "VMware Tools can't be installed on this disk. The version of OS X is too new."
I'm not making that up.
The Delete VMware Tools package was present too and that worked but then none of the features that Tools provides were present (screen size 1024x768 is no fun
) and Tools would still not install, giving the same reason.
I had let Fusion update itself to 8.5.6 and I noticed that Tools packages were downloaded separately though automatically and must have been integrated into the Fusion 8.5.6 package during the update. So I tried deleting Fusion from the Applications folder and did a full install using the 8.5.6 installer. Tools still refused to install because the OS X guest was too new, suggesting that the built-in OS X Tools installer is not the newest version (which would only be noticed by either new purchasers or Fusion updaters with OS X 10.11 VM's who manually update Tools in OS X guests since the Virtual Machine menu says to Reinstall VMware Tools rather than Update, implying that updating isn't necessary). I was eventually able to locate "VMware-Tools-10.1.5-other-5055683" on the VMware website thanks to Google and some tinkering with version numbers in the URL, downloaded and installed it and El Capitan now works properly.
So while I don't have a solution for the Internal Error problem, be warned about updating Tools in the newest OS X VM's if you have them.
