Update 4 brought official support for Windows 10 (specifically versions 1507 and 1511 at the time). This allowed engineers to upgrade their laptops and workstations without being forced into an immediate, expensive migration to TIA Portal V14 or V15. This extended the lifecycle of existing projects while keeping the engineering hardware current.
If you are locked into V13 SP1 for compliance or hardware reasons, consider Update 4 not an optional patch, but an essential productivity tool. It is the difference between wrestling with your IDE and letting the IDE work for you. Update your engineering workstation, apply the patch, and watch your daily workflow transform from frustrating to fluid. siemens tia portal v13 sp1 update 4 better work