I had use the Old version of VMWare Workstation and then try to update the latest version using command line parameters "/s /v/qn REBOOT=ReallySuppress EULAS_AGREED=1". It got failed with error "Error Code : 1603 , Error Message : Fatal error during installation.".
And then the application seems to get uninstalled. Please explain why the application got uninstalled automatically.
That is because Workstation can not be updated in place.
The routine always is "uninstall - when that worked - install new version"
Actually the command line supports upgrade installer with format
<--*.exe /s /v"/qn EULAS_AGREED=1 REBOOT=Reallysuppress">, the error message shows that installer hit some unexpected issue. Would you please upload the installer log (vminst.log and vmmis_xxxx.log) which locates in %temp% folder ?