How does Windows update know not to load W10 1903? I have VM Ware Workstation 12.5 on several workstations. When I run Check for Updates it stops at 1809 with an option to download and install 1903 and now 1909. I know there is an issue with VM Ware Workstation and W10 1903. I do have VM Ware Workstation 15.2 happily running under W10 1903. What is Microsoft doing differently with updates from 1809 to 1903 and 1909? Are these consider major updates like when we went from W7 to W10? How does it know not to apply 1903 when VM Ware Workstation is present? Is this actually built into the update code? Is it now safe to apply 1903 with VM Ware Workstation 12.5 or should I upgrade all the computers to VM Ware Workstation 15.2? The images I have built do not need W 2019 Server which is why they have not been upgraded.