Agree that VMware dropped the ball on this. They buried the notice that ThinPrint was being removed in the 13.5 release notes and did not advise anywhere else. The Tech Preview that just concluded didn't even give us a clue that the feature was being removed.
My suspicion is that the capability was included in the virtual machine configuration by default if you created a virtual machine with Fusion, awaiting you to turn it on if you wished.
The workaround is to edit the .vmx file manually and remove the lines that reference serial0 (two of which have reference to "thinprint".
Then use other means to configure printers. If you're on a bridged network, Windows should be able to find any networked printers. If you're on NAT networking, try enabling printer sharing for printers defined on your Mac. Windows should be able to pick those up automatically.