: Projects created in TIA V12 or V13 without SP1 cannot be opened directly in V14 or higher. They must first be compiled and saved in V13 SP1 before they can be upgraded to more modern versions like V17 or V18. License Compatibility
: The primary source for downloading and reviewing the changes in Updates for STEP 7 V13 SP1 and WinCC V13 SP1 covers all fixes and improvements. siemens tia portal v13 sp1 update 4 better 2021